Dummy package for .bib files

I think any BibTeX installation will have this one available

 texmf-dist/bibtex/base/xampl.bib

That is (in texlive at least) in the default path so you can do:

\documentclass{article}


\bibliographystyle{plain}
\begin{document}
\nocite*

\bibliography{xampl}

\end{document}

or cite a specific entry such as

@ARTICLE{article-minimal,
   author = {L[eslie] A. Aamport},
   title = {The Gnats and Gnus Document Preparation System},
   journal = {\mbox{G-Animal's} Journal},
   year = 1986,
}

Users of biblatex may add

\addbibresource{biblatex-examples.bib}

to their preamble and thereby make available a sample bibliography with about 70 entries. The contents of this file can be viewed here.

Note: This .bib file uses biblatex-specific field types like journaltitle and is therefore not suitable for users of traditional BibTeX/.bst files.