documentclass[10pt,notitlepage]{article}
usepackage{fancyhdr}
pagestyle{fancy}
fancyhf{}
lhead{leftmark}
rhead{thepage}

begin{document}
printbibliography[heading=bibintoc,title={References}]
section*{Appendix}
        addcontentsline{toc}{section}{Appendix}
        renewcommand{thesubsection}{Alph{subsection}}
        subsection{Detailed Subject Data}
end{document}