The skeleton of my article looks like
\documentclass[10pt, twoside]{article}
\title{An Example}
\author{S. Barman Roy}
\begin{document}
....
\bibliographystyle{unsrt}
\bibliography{library}
\end{document}
Among the bib items, whenever an article has only two authors, it's appearing perfectly as
[1] John Doe and Richard Rane ....
However, when I have more than two authors for an article, it appears as
[1] Johan Doe, Richard Rane, and Tommy Atkins...
How do I get rid of the comma before the and? The problem persists even if I change the bib style to something else, 'IEEEtran' for example, which I use most frequently.