\documentclass[oneside,openany,phd]{Isfahan_thesis}

\usepackage{xepersian}
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\defpersianfont\nastaliq[Scale=1.8]{IranNastaliq}
\defpersianfont\chapternumber[Scale=2]{XB Zar}
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\renewcommand{\bibname}{مراجع}

\begin{document}
\cite{anderson1992rings},\cite{araya2009auslander},\cite{araya2005homological},\cite{asadollahi2011homotopy},\cite{assem2006elements}
{\small
\setLTRbibitems
\makeatletter
\bidi@AtBeginEnvironment{thebibliography}{\resetlatinfont}
\makeatother
\bibliographystyle{siam}
\bibliography{Refs} 
}
\end{document}