% Save the following six lines as "mreprex.tex"
\documentclass{article}
\begin{document}
Example citation: \cite{Turner2021}
\bibliographystyle{plain}
\bibliography{mreprex}
\end{document}
% Save the following six lines as "mreprex.bib"
@manual{Turner2021,
    title = {The db {D}istribution},
    author = {Rolf Turner},
    year = {2021},
    note = {\textsf{R} package version 0.0-21}
}