What I Want

I want my reference output to look like this for all online resources who do have all the values to fill out all of the following fields:

{NAME},{First Name},{Publishing year}. Titel des Artikels: {Subtitle}. In: {Name of the newspaper} [online]. {Publishing date of the article}[Zugriff am: {tt.mm.jjjj}]. Verfügbar unter: {DOI | URL}.

Note: Everything in {} should be replaced with an actual value.

An example:

BRÖHM, Alexandra, 2016. Biometrische Systeme: Ein Passwort kann man ändern, die eigene Iris nicht. In: Süddeutsche Zeitung [online]. 01.09.2016 [Zugriff am: 21.08.2017]. Verfügbar unter: http://www.sueddeutsche.de/digital/biometrische-systeme-ein-passwort-kann-man-aendern-die-eigene-iris-nicht-1.3144344.

The Code

I'm using Overleaf with pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018). In my preamble I've got the following code:

%Bibliography management 


%Silence annoying warnings e.g.: Package biblatex Warning: File 'german-ieee.lbx' not found!
\WarningFilter{biblatex}{File 'ngerman-ieee.lbx'}
\WarningFilter{biblatex}{File 'german-ieee.lbx'}
\WarningFilter{biblatex}{File 'english-ieee.lbx'}

% for using multiple files

What I've tried

I've tried to use \DeclareFieldFormat{urldate}{\mkbibbrackets{Zugriff am Tag: \bibstring{urldate}\space#1}}, but this always gives me the error Package biblatex Warning: Bibliography string 'urldate' undefined at entry [...] and I've searched for a style or package which does this by default for me, but could not find any.


There is indeed no biblatex bibstring called urldate. Did you perhaps mean urlseen? But you probably don't need it, as you've already hardcoded Zugriff am Tag.


\DeclareFieldFormat{urldate}{\mkbibbrackets{Zugriff am Tag:\space#1}}

should work; though you might want to make things a bit more streamlined with


  urlseen = {Zugriff am}


Note that you don't need \bibliography{references}: just \addbibresource{reference.bib} is enough.

  • I slightly reworded the first sentence to avoid mentioning 'label' and 'key' because those words could be mistaken for technical terms like entry key and (citation/alphabetic/numeric) label. While I was at it I also moved the colon from the bibstring to the field format (usually there is no trailing punctuation in bibstrings). Feel free to revert this edit if you disagree. – moewe Nov 20 '19 at 6:40
  • @moewe Not at all, thanks for the edit! – imnothere Nov 20 '19 at 7:10
  • Could you please clarify why urldate is no biblatex string? I can use such a string in my .bib file without any errors or warnings. I'm also wondering how I can get the URL part working as it would have to be moved to the end and this (online) part is only visible with langid={English} which does of course not work with the DefineBibliographyStrings{ngerman}. – ShadowDragon Nov 20 '19 at 11:09

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