LaTeX Forum

\documentclass[12pt,a4paper,]{scrreprt}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[square]{natbib} 			
		
\begin{document}

123456\cite{Meschede2010}....
\bibliographystyle{plaindin}
\bibliography{./texfiles/literatur}
\end{document}

@BOOK{Meschede2010,
	AUTHOR = {Meschede, Dieter},
	YEAR = {2010},
	TITLE = {Gerthsen Physik},
	EDITION = {24. Auflage},
	ISBN = {978-3-642-12894-3},
	PUBLISHER = {Springer-Verlag},
	ADDRESS = {Berlin, Heidelberg},
}

! Package natbib Error: Bibliography not compatible with author-year citations.
(natbib) Press <return> to continue in numerical citation style.
See the natbib package documentation for explanation.
Type H <return> for immediate help.
...
l.11 ...mand\NAT@force@numbers{}\NAT@force@numbers
Check the bibliography entries for non-compliant syntax,
or select author-year BibTeX style, e.g. plainnat

\begin{filecontents}{\jobname.bib}
	@BOOK{Meschede2010,
		AUTHOR = {Meschede, Dieter},
		YEAR = {2010},
		TITLE = {Gerthsen Physik},
		EDITION = {24. Auflage},
		ISBN = {978-3-642-12894-3},
		PUBLISHER = {Springer-Verlag},
		ADDRESS = {Berlin, Heidelberg},
	}
\end{filecontents}
\documentclass[12pt,a4paper,]{scrreprt}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[
style=authoryear
%style=numeric
]{biblatex}          
\addbibresource{\jobname.bib}
\begin{document}

123456\cite{Meschede2010}....

\printbibliography
\end{document} 

\usepackage[square]{natbib}

\usepackage[square,numbers]{natbib}
\bibliographystyle{natdin} 

\documentclass[12pt,a4paper,]{scrreprt}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[
	%style=authoryear,style=numeric
]{biblatex}

\usepackage{csquotes}         

\addbibresource{./texfiles/literatur.bib}

\begin{document}

123456
\cite{DIN66001}
\cite{Meschede2010}....

\printbibliography

\end{document}

\begin{filecontents}{\jobname.bib}