My dissertation requires a very specific format of Harvard-style referencing, with a comma only after the first author in the bibliography, like so:
Simmons JG, Badcock PB Whittle SL Byrne ML Mundy L Patton GC Olsson CA and Allen NB (2016). The lifetime experience...
I am using natbib and an version of agsm edited to remove title quotes, comma after year and periods between author initials (also required), producing this:
\begin{filecontents*}{\example.bib}
@article{simmons2016lifetime,
title={The lifetime experience of traumatic events is associated with hair cortisol concentrations in community-based children},
author={Simmons, Julian G and Badcock, Paul B and Whittle, Sarah L and Byrne, Michelle L and Mundy, Lisa and Patton, George C and Olsson, Craig A and Allen, Nicholas B},
journal={Psychoneuroendocrinology},
volume={63},
pages={276--281},
year={2016},
publisher={Elsevier}
}
\end{filecontents*}
\documentclass{article}
\usepackage{natbib}
\bibliographystyle{agsm-mod} %issue is the same with unmodified agsm
\let\oldthebibliography\thebibliography
\renewcommand\thebibliography{\let\bf\relax\oldthebibliography}
\begin{document}
\nocite{*}
\bibliography{example}
\end{document}
What do I need to change to get the format I need?