bibliography not numbered

I am unable to number my bibliography using bibtex and a chicago style downloaded for this purpose. The numbering issue was present prior to the implementation of the chicago style add-in so I doubt that's the problem. I have looked at other examples, many of which appear to be one option taking precedent over another or a separate package making the modification. I can't seem to be able to figure this one out. please help. (Also, the brackets were not defaulting to round and I had to force the option, maybe that's a clue?)

\documentclass[11pt]{article}
\usepackage{graphics}
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{amsmath}   % improved mathematical formulas
\usepackage[round]{natbib}    % for citations (Endnote)
\usepackage{rotating}
\usepackage{booktabs}
\usepackage{amsmath}
\usepackage{verbatim}
\usepackage{multicol}

\setcounter{MaxMatrixCols}{10}
\DeclareMathOperator*{\plim}{plim}
\renewcommand{\baselinestretch}{1.5}

\begin{document}
\bibliographystyle{chicago}

\section{}
etc...
\section{}
text

\clearpage

\bibliography{terrvar}  % terrvar.bib is the library

% followed by tables and figures
\end{document}

• I'm not sure how to interpret the objective "numbering the bibliography section". In the posted answer, I've assumed you wish to get a numbered sectioning header. If this assumption is incorrect, and if you want numeric citation callouts instead, you should load natbib with the option numbers.
– Mico
Oct 21, 2014 at 20:42

Since you're using the article document class, you can get a numbered references section by adding the following instructions to the preamble:
\usepackage{etoolbox}

If you were using the report or book document class (or a document class that's based on either of these classes) you'd replace \section* with \chapter* and \section with \chapter.