For simple documents, full bibliography management may seem an overkill, especially in cases where the entries in the bibliography may never be used by other documents. In such cases a simple system of adding a section such as follows will do,
\begin{thebibliography}
...
\end{thebibliography}
An entry in this embedded system will look like as follows
\begin{thebibliography}
\bibitem{lamport94}
Leslie Lamport,
\textit{\LaTeX: a document preparation system},
Addison Wesley, Massachusetts,
2nd edition,
1994.
\end{thebibliography}
which can then be cited using the \cite{...} command in your LaTeX document, with the citation key being the parameter to the \bibitem{...} command above. In this example, this would be \cite{lamport94}. This bibliography may then be verbatim added to your documents,
\documentclass[11pt]{article}
\begin{document}
Citing entry from my bibliography \cite{lamport94}.
\begin{thebibliography}{10}
\bibitem{lamport94}
Leslie Lamport,
\textit{\LaTeX: a document preparation system},
Addison Wesley, Massachusetts,
2nd edition,
1994.
\end{thebibliography}
\end{document}
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