[OS X TeX] citation in text fail to appear as expected

[Themis Matsoukas]

On May 19, 2012, at 7:50 AM, konstantinos vasilakos wrote:

> Do I have to make a bibliography command \bibliography in order to achieve it or this comes only when I want to place a Bibliography section ?

Yes. Here is a minimal example that should work provided that you have a bib file with the references you cite. 
Run Latex, run bibtex, then run latex again a couple times. 

\documentclass[11pt]{article}
\begin{document}
\title{Sample bibliography}
\maketitle
\section{Introduction}
As shown by \cite{xyz} blah blah

\bibliographystyle{plain}
\bibliography{your_bib_file_name_here}

\end{document}

tm