Cite all authors on first citation

[Ntgllr]

I'm completely new to LaTeX and wanted to use it writing my seminar paper (I'm a Public Health student in germany)

For citation we need to use either DGP or APA which are very similar. Unfortunately when I first cite an entry from my .bib biblatex wouldn't display every author as required by APA, but starts immediately with using "et al."

`\documentclass[11pt]{article}

\usepackage[ngerman]{babel}
\usepackage{filecontents}

\begin{filecontents}{literature.bib}
@article{kuepke2020,
  title = {{Gesetz f\"ur den Schutz vor Masern und zur St\"arkung der Impfpr\"avention (Masernschutzgesetz)}},
  author = {K{\"u}pke, NK and {Matysiak-Klose}, D and Siedler, A and Wiechmann, O and Diercke, M},
  year = {2020},
  month = mar,
  publisher = {{Robert Koch-Institut}},
  doi = {10.25646/6526},
  collaborator = {{Koch-Institut}, Robert and {Koch-Institut}, Robert},
  language = {de}
}
\end{filecontents}

\usepackage[backend=biber, style=apa]{biblatex}
\addbibresource{literature.bib}

\begin{document}

\title{Sample Document}
\author{Bob Smith}
\date{Today}
\maketitle

Blah blah blah blah blah blah \parencite{kuepke2020}. 

\printbibliography
\end{document}`

This Code would output: Blah blah blah blah blah blah (Küpke et al., 2020).

Please help me figuring this out.

Regards Ntgllr

[moewew]

This is expected in 7th-edition APA style, cf. https://apastyle.apa.org/style-grammar-guidelines/references/examples/journal-article-references. There is no difference between first and subsequent citations any more: APA style goes immediately to "et al."

What you describe sounds like 6th-edition APA style, which you can now get with biblatex-apa6's style=apa6,.

\documentclass[11pt]{article}
\usepackage[ngerman]{babel}
\usepackage{csquotes}
\usepackage[backend=biber, style=apa6]{biblatex}

\begin{filecontents}{\jobname.bib}
@article{kuepke2020,
  title        = {{Gesetz für den Schutz vor Masern und zur Stärkung der Impfprävention (Masernschutzgesetz)}},
  author       = {Küpke, N. K. and Matysiak-Klose, D. and Siedler, A. and Wiechmann, O. and Diercke, M.},
  year         = {2020},
  month        = mar,
  publisher    = {{Robert Koch-Institut}},
  doi          = {10.25646/6526},
  collaborator = {{Koch-Institut}, Robert and {Koch-Institut}, Robert},
  language     = {de},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
Blah blah blah blah blah blah \autocite{kuepke2020}. 

\printbibliography
\end{document}

[Ntgllr]

This is expected in 7th-edition APA style, cf. https://apastyle.apa.org/style-grammar-guidelines/references/examples/journal-article-references. There is no difference between first and subsequent citations any more: APA style goes immediately to "et al."

What you describe sounds like 6th-edition APA style, which you can now get with biblatex-apa6's style=apa6,.

\documentclass[11pt]{article}
\usepackage[ngerman]{babel}
\usepackage{csquotes}
\usepackage[backend=biber, style=apa6]{biblatex}

\begin{filecontents}{\jobname.bib}
@article{kuepke2020,
  title        = {{Gesetz für den Schutz vor Masern und zur Stärkung der Impfprävention (Masernschutzgesetz)}},
  author       = {Küpke, N. K. and Matysiak-Klose, D. and Siedler, A. and Wiechmann, O. and Diercke, M.},
  year         = {2020},
  month        = mar,
  publisher    = {{Robert Koch-Institut}},
  doi          = {10.25646/6526},
  collaborator = {{Koch-Institut}, Robert and {Koch-Institut}, Robert},
  language     = {de},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
Blah blah blah blah blah blah \autocite{kuepke2020}. 

\printbibliography
\end{document}

Thank you so much for your fast reply. This solved the problem for me.