How to add parenthesis around ``year'' field?



Hello all,

I am writing an essay using LaTeX + AUCTeX. I use BIBTeX, harvard.sty
and a .bib file to generate citations and references. Everything works
fine except that the generated reference entry is like this:

Higgins, S. I., Richardson, D. M. & Cowling, R. M. 1996, `Modeling
invasive plant spread: the role of plant-environment interactions and
model structure', Ecology 77(7), 2043-2054.

I want the output to be like this, with parenthesis around the year
``1996'':

Higgins, S. I., Richardson, D. M. & Cowling, R. M. (1996), `Modeling
invasive plant spread: the role of plant-environment interactions and
model structure', Ecology 77(7), 2043-2054.

But seems no bibliography styles provided by harvard.sty works.

The source file:

\documentclass[oneside,a4paper,11pt]{article}
\usepackage{harvard}
\usepackage[a4paper,left=1in,right=1in,top=1in,bottom=1in]{geometry}
\begin{document}
\cite{higgins96:_model_invas_plant_spread}

\bibliographystyle{agsm}
\bibliography{steven}
\end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End:

and the entry in my .bib file:

@Article{higgins96:_model_invas_plant_spread,
author = {Steven I. Higgins and David M. Richardson and Richard
M. Cowling},
title = {Modeling Invasive plant spread: the role of
plant-environment interactions and model structure},
journal = {Ecology},
year = 1996,
volume = 77,
number = 7,
pages = {2043--2054}}

Can anyone tell me how to add the parenthesis in ways other than adding
them one by one in the .bib file?

Regards,

H. Xu

.



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