Where are the bibliographic styles?
The class cjs-rcs-article uses its own bibliography styles to typeset the list of references: cjs-rcs-en
for articles in English, and cjs-rcs-fr
for articles in French.
If you have an up-to-date TeX distribution, the styles will already be installed on your system with the class through the package cjs-rcs-article and are ready for use. You may check with the following commands issued from a command line:
kpsewhich cjs-rcs-en.bst
kpsewhich cjs-rcs-fr.bst
If you opted for a local or manual installation of the class, the bibliographic styles reside in your project directory.