%% 
%%  Ein Beispiel der DANTE-Edition
%%  Bibliografie mit LaTeX
%%  2. Auflage
%%  Beispiel 03-09-22 auf Seite 97.
%%  Copyright (C) 2016 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% ==bibtex== 
% Show page(s) 1
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\usepackage{filecontents}
\begin{filecontents*}{natbibdemo.bib}
@Book{Bechtolsheim:TP93a,
  author    = {von Bechtolsheim, Stephan},
  title     = {{\TeX} in {P}ractice: {B}asics},
  publisher = {Spring{\-}er-Ver{\-}lag},
  year      = 1993,
  ISBN      = {0-387-97595-0},
  LCCN      = {Z253.4.T47 B4 1993},
  volume    = 1,
  address   = {Berlin, Germany~/ Heidelberg, Germany~/ London, UK~/ etc.},
}
\end{filecontents*}
\usepackage[T1]{fontenc}
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\usepackage[ngerman]{babel}
\setlength\parindent{0pt}
\usepackage{url}
\AtBeginDocument{\small
\bibliographystyle{deChicago}}
\AtEndDocument{\clearpage
\bibliography{natbibdemo}}
%StartShownPreambleCommands
\usepackage{natbib}
\setcitestyle{notesep=;,open=<,close=>,aysep={},yysep=;}
%StopShownPreambleCommands
\begin{document}
\citet{Bechtolsheim:TP93a}\\
\Citet{Bechtolsheim:TP93a}\\
\Citep{Bechtolsheim:TP93a}\\
\Citep[siehe][]{Bechtolsheim:TP93a}\\
\Citep[siehe][S.~2]{Bechtolsheim:TP93a}\\
\end{document}