Reviewers are invited to review papers by journal editors, either by using an online submission and peer review system or over e-mail. 

Most Sage Journals utilize a submission system, so please be wary of e-mail invitations from a journal with an online system; reviewer invitations are only sent via the system. Confirm the invitation with the editorial office; a journal's contact information is located on the Manuscript Submission Guidelines.

You can find resources for reviewing within the system on the Using Sage Track page of the Sage Reviewer Gateway.