\documentclass[12pt,oneside]{book}

\usepackage[pagebackref=true,colorlinks,linkcolor=red,citecolor=red]{hyperref}
\usepackage{makeidx}
\usepackage{xepersian}



\settextfont[Scale=1]{XB Zar}
\setlatintextfont[Scale=1]{Times New Roman}
\setdigitfont[Scale=1]{XB Zar}

\begin{document}
\cite{bib1}
\cite{bib3}

\bibliographystyle{unsrt}
\begin{thebibliography}{99}
\resetlatinfont
\begin{LTRitems}

\bibitem{bib1} latin bib

\end{LTRitems}

\bibitem{bib3}  مرجع فارسی

\end{thebibliography}
\end{document}