\documentclass[10pt]{article}
\begin{document}
\begin{thebibliography}{99}
\bibitem{reference} text
\end{thebibliography}
\end{document}
\documentclass[10pt]{article}
\begin{document}
\begin{thebibliography}{99}
\bibitem{reference} text
\end{thebibliography}
\end{document}