Customize bibliography style with natbib

Customize bibliography style with natbib

Using the code below, my bibliography looks like this
..
How do I force LateX to:
Put the authors in alphabetical order by last name (eg. Basdevant and then
Hall)
Put the last name of the first author first (eg. Basdevant, Oliver)
\documentclass{article}
\usepackage[round]{natbib}
\begin{document}
According to \citet{hall2003} ...
\bibliographystyle{plainnat}
\bibliography{/Users/joedangerstox/Documents/library}
\end{document}