Besides the SCSU deafault

Refworks
https://www.refworks.com/refworks2/default.aspx?r=authentication::init&groupcode=RWStCloudSU

and the much more discussed

Zotero http://www.zotero.org/

and

Mendeley http://www.mendeley.com/

There are about dozen more tools, which you might find your students prefer to use:

http://www.citefast.com/

http://www.harvardgenerator.com/

http://www.neilstoolbox.com/bibliography-creator/  

http://www.citethisforme.com/

http://www.ottobib.com/

http://www.easybib.com/

http://citationmachine.net/index2.php

http://www.bibme.org/

citations for mobile devices

3 Good iPad Apps for Creating Citations and Bibliographies

http://www.educatorstechnology.com/2014/06/3-good-ipad-apps-for-creating-citations.html?m=1