diff --git a/bib/project_bibliography.bib b/bib/project_bibliography.bib
index 30b0dad7589a6794a9a15e2284a561c18ca9fddd..734443a99d69057f8651c90d6de9d0d3f1bd88f7 100644
--- a/bib/project_bibliography.bib
+++ b/bib/project_bibliography.bib
@@ -1,116 +1,207 @@
 @book{westermann:tabellenbuch,
-	author		= {Dr. Michael Dzieia and Heinrich Hübscher and Dieter Jagla and Jürgen Klaue and Hans-Joachim Petersen and Harald Wickert},
-	title		= {Elektronik Tabellen: Betriebs- und Automatiesierungstechnik},
-	year		= {2016},
-	edition		= {2},
-	publisher	= {Westermann},
-	isbn		= {9-783142-450353},
-	language	= {GER},
+  author    = {Dr. Michael Dzieia and Heinrich Hübscher and Dieter Jagla and Jürgen Klaue and Hans-Joachim Petersen and Harald Wickert},
+  title     = {Elektronik Tabellen: Betriebs- und Automatiesierungstechnik},
+  year      = {2016},
+  edition   = {2},
+  publisher = {Westermann},
+  isbn      = {9-783142-450353},
+  language  = {GER}
 }
 @manual{laboranleitung:physik,
-	author		= {Fachschaft Physik},
-	editor		= {},
-	title		= {Laboranleitung für das Physiklabor},
-	date		= {2020-03-01},
-	url			= {https://docs.f1.Hs-Hannover.de/dl_fachgebiete/labore.php?id_fachgebiet=4},
-	urldate		= {2020-03-23},
-	language 	= {GER}
+  author   = {Fachschaft Physik},
+  editor   = {},
+  title    = {Laboranleitung für das Physiklabor},
+  date     = {2020-03-01},
+  url      = {https://docs.f1.Hs-Hannover.de/dl_fachgebiete/labore.php?id_fachgebiet=4},
+  urldate  = {2020-03-23},
+  language = {GER}
 }
 @manual{laboranleitung:elektrotechnik,
-	author		= {Fachschaft Grundlagen Elektrotechnik},
-	title		= {Laboranleitung für das Labor Elektrotechnische Grundlagen},
-	date		= {2016-06-07},
-	url			= {https://docs.f1.hs-hannover.de/dl_fachgebiete/labore.php?id_fachgebiet=3},
-	urldate		= {2020-03-30},
-	language	= {GER}
+  author   = {Fachschaft Grundlagen Elektrotechnik},
+  title    = {Laboranleitung für das Labor Elektrotechnische Grundlagen},
+  date     = {2016-06-07},
+  url      = {https://docs.f1.hs-hannover.de/dl_fachgebiete/labore.php?id_fachgebiet=3},
+  urldate  = {2020-03-30},
+  language = {GER}
 }
 @manual{laboranleitung:messtechnik1,
-	author		= {Prof. Dr.-Ing. S. Beißner and Prof. Dr.-Ing. M. Koch and Prof. Dr.-Ing. M. Kesting and
-					Prof. Dr.-Ing. M. Lassahn and Prof. Dr.-Ing. D. Hisseine and M.Sc. Brech and
-					M.Eng. Schwarze and Prof. Dr.-Ing. D. Stolle},
-	title		= {Laboranleitung für das Labor Grundlagen Messtechnik},
-	date		= {2019-08-12},
-	url			= {https://moodle.hs-hannover.de/pluginfile.php/359636/course/section/183463/LGM-Laboranleitung_EIT_20190812.pdf},
-	urldate		= {2019-08-11},
-	language	= {GER}
+  author   = {Prof. Dr.-Ing. S. Beißner and Prof. Dr.-Ing. M. Koch and Prof. Dr.-Ing. M. Kesting and
+              Prof. Dr.-Ing. M. Lassahn and Prof. Dr.-Ing. D. Hisseine and M.Sc. Brech and
+              M.Eng. Schwarze and Prof. Dr.-Ing. D. Stolle},
+  title    = {Laboranleitung für das Labor Grundlagen Messtechnik},
+  date     = {2019-08-12},
+  url      = {https://moodle.hs-hannover.de/pluginfile.php/359636/course/section/183463/LGM-Laboranleitung_EIT_20190812.pdf},
+  urldate  = {2019-08-11},
+  language = {GER}
 }
 %-----------------------Templates--------------------------------------------------------
 % A single-volume book with one or more authors
-@book{1,
-	author		= {},
-	title		= {},
-	date		= {},
-	year		= {},
-	edition		= {},
-	publisher	= {},
-	isbn		= {},
-	language	= {},
-	location	= {},
-	series		= {},
-	abstract	= {},
-	pagetotal	= {},
-	url			= {},
-	urldate		= {}
+% required fields: { author, title, year/date }
+@book{z_book-key,
+  author         = {},
+  title          = {},
+  date           = {},
+  year           = {},
+  doi            = {},
+  isbn           = {},
+  url            = {},
+  urldate        = {},
+  language       = {},
+  origlanguage   = {},
+  editor         = {},
+  editora        = {},
+  editorb        = {},
+  editorc        = {},
+  translator     = {},
+  annotator      = {},
+  commentator    = {},
+  introduction   = {},
+  foreword       = {},
+  afterword      = {},
+  subtitle       = {},
+  titleaddon     = {},
+  maintitle      = {},
+  mainsubtitle   = {},
+  maintitleaddon = {},
+  volume         = {},
+  part           = {},
+  edition        = {},
+  volumes        = {},
+  series         = {},
+  number         = {},
+  note           = {},
+  publisher      = {},
+  location       = {},
+  pages          = {},
+  pagetotal      = {},
+  addendum       = {},
+  pubstate       = {}
 }
 % article in a journal, magazine, newspaper, or other periodical
-@article{2,
-	author		= {},
-	title		= {},
-	journaltitle= {},
-	date		= {},
-	year		= {},
-	journalsubtitle= {},
-	issuetitle	= {},
-	series		= {},
-	language	= {},
-	origlanguage= {},
-	translator	= {},
-	pages		= {},
-	url			= {},
-	urldate		= {}
+% required fields: { author, title, year/date }
+@article{z_article-key,
+  author            = {},
+  title             = {},
+  date              = {},
+  year              = {},
+  doi               = {},
+  issn              = {},
+  url               = {},
+  urldate           = {},
+  language          = {},
+  origlanguage      = {},
+  translator        = {},
+  annotator         = {},
+  commentator       = {},
+  subtitle          = {},
+  titleaddon        = {},
+  editor            = {},
+  editora           = {},
+  editorb           = {},
+  editorc           = {},
+  journalsubtitle   = {},
+  journaltitleaddon = {},
+  issuetitle        = {},
+  issuesubtitle     = {},
+  issuetitleaddon   = {},
+  series            = {},
+  volume            = {},
+  number            = {},
+  issue             = {},
+  month             = {},
+  pages             = {},
+  version           = {},
+  note              = {},
+  addendum          = {},
+  pubstate          = {}
 }
-% technical report/paper, published by a university
-@report{3,
-	author		= {},
-	title		= {},
-	type		= {},
-	institution	= {},
-	date		= {},
-	year		= {},
-	url			= {},
-	urldate		= {},
-	version		= {},
-	language	= {}
+% technical or other documentation, not necessarily in printed form
+% required fields: { author/editor, title, year/date }
+@manual{z_manual-key,
+  author       = {},
+  editor       = {},
+  title        = {},
+  year         = {},
+  date         = {},
+  doi          = {},
+  isbn         = {},
+  url          = {},
+  urldate      = {},
+  language     = {},
+  subtitle     = {},
+  titleaddon   = {},
+  edition      = {},
+  type         = {},
+  number       = {},
+  version      = {},
+  note         = {},
+  organization = {},
+  publisher    = {},
+  pagetotal    = {},
+  addendum     = {},
+  pubstate     = {}
 }
-% Technical or other documentation, not necessarily in printed form
-@manual{4,
-	author		= {},
-	editor		= {},
-	title		= {},
-	date		= {},
-	year		= {},
-	url			= {},
-	urldate		= {},
-	language	= {}
+% article in a conference proceedings
+% required fields: { author, title, booktitle, year/date }
+@inproceedings{z_inproceedings-key,
+  author          = {},
+  title           = {},
+  booktitle       = {},
+  year            = {},
+  date            = {},
+  editor          = {},
+  subtitle        = {},
+  titleaddon      = {},
+  eventtitle      = {},
+  eventtitleaddon = {},
+  eventdate       = {},
+  series          = {},
+  number          = {},
+  organization    = {},
+  publisher       = {},
+  location        = {},
+  isbn            = {},
+  doi             = {},
+  pages           = {},
+  addendum        = {},
+  pubstate        = {},
+  url             = {},
+  urldate         = {},
+  language        = {}
 }
-% web sites which are intrinsically online resources
-@online{5,
-	author		= {},
-	title		= {},
-	date		= {},
-	year		= {},
-	url			= {},
-	urldate		= {},
-	language	= {}
+% technical report/paper, published by a university
+% required fields: { author, title, type, institution, year/date }
+@report{z_report-key,
+  author      = {},
+  title       = {},
+  version     = {},
+  type        = {},
+  institution = {},
+  date        = {},
+  year        = {},
+  url         = {},
+  urldate     = {},
+  language    = {}
 }
 % a Thesis
-@phdthesis{6,
-	author		= {},
-	title		= {},
-	school		= {},
-	date		= {},
-	year		= {},
-	address		= {},
-	month		= {},
-	note		= {},
+@phdthesis{z_phdthesis-key,
+  author  = {},
+  title   = {},
+  school  = {},
+  date    = {},
+  year    = {},
+  address = {},
+  month   = {},
+  note    = {}
+}
+% web sites which are intrinsically online resources
+% required fields: { author/editor, title, year/date, doi/eprint/url }
+@online{z_online-key,
+  author   = {},
+  title    = {},
+  date     = {},
+  year     = {},
+  url      = {},
+  urldate  = {},
+  language = {}
 }