\renewcommand{\bibname}{References}
OR use the following code,
\makeatletter
\def\thebibliography#1{\chapter*{References\@mkboth
{REFERENCES}{REFERENCES}}\list
{[\arabic{enumi}]}{\settowidth\labelwidth{[#1]}\leftmargin\labelwidth
\advance\leftmargin\labelsep
\usecounter{enumi}}
\def\newblock{\hskip .11em plus .33em minus .07em}
\sloppy\clubpenalty4000\widowpenalty4000
\sfcode´\.=1000\relax}
\makeatother