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Thank you so much for taking the time to check for me. I found the problem, and it was something else in my citations file. Thanks again.

I'm working with a document of the following form:

\documentclass[10pt]{amsart}
\usepackage{hyperref}
\usepackage{latexsym,amsfonts,amssymb,amsmath,amsthm,graphicx}

\begin{document}

MY DOCUMENT HERE

\bibliographystyle{plain}
\bibliography{citations}

\end{document}

No matter what I do, I can ...