A good way to get started with Mendeley is to visit the Information Retrieval Services’ (IVS-BM) website. The page Mendeley short notes will give you a quick overview and by attending an online workshop you could learn more about the system.

Some other guides and video tutorials we would like to recommend you are the following:

• Mendeley Video Tutorials
  http://www.mendeley.com/videos-tutorials
• Mendeley FAQs
  http://support.mendeley.com/
• Ithaca College Library:
  Mendeley Reference Manager
  http://www.ithacalibrary.com/sp/subjects/MRM

You are not sure which system best suits your needs?
See a nice video from Portland State University Library Zotero vs. Mendeley.