How can I add references at the end of every chapter in a latex file. I am trying to use biblatex, but can't seem to get it to work.
\documentclass[draft,phd,12pt]{psuthesis}
\usepackage[citestyle=authoryear,refsection=chapter,natbib=true, backend=biber]{biblatex}
\bibliography{library}
\chapter{Introduction}
\cite{Abdelaziz2007}
\printbibliography
The output is 
and no references