The Bedford Handbook, 7th Edition,
Online Resources
This site contains links for writing exercises, grammar exercises, and comprehensive guides for research documentation. All students have access to this site.
http://bcs.bedfordstmartins.com/bedhandbook7e/default.asp

The Bedford Handbook Exercise Central
This site provides comprehensive grammar exercises. Once you are registered, you simply click on "Start using Exercise Central." Choose the grammar exercise you want to work on.  At the end of each exercise lesson, click on "submit" and view your results and accompanying explanation of any errors. 
http://bedfordstmartins.com/exercisecentral/

The Purdue Online Writing Lab (OWL)
This is THE site for help with research and documentation of sources.
http://owl.english.purdue.edu/