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\documentclass[10pt]{article}
\usepackage{natbib}
\renewcommand{\bibnumfmt}[1]{{#1}.}
\usepackage[superscript]{cite}
\begin{document}
\noindent \large {\bf Title}
Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah. \cite{one,two,three}
\bibliographystyle{plain}
\begin{thebibliography}{10}
\bibitem{one}
Reference 1
\bibitem{two}
Reference 2
\bibitem{three}
Reference 3
\end{thebibliography}
\end{document}