1. Explore (web)
2. Background (library catalog: books)
3. Scholarly conversations (library databases: articles)
4. Support arguments (source citation)
5. Drafts & revisions (librarians & Center)
From SU Libraries: Easybib Academic Edition
Easybib is nice, but you always have the most control over the accuracy of your citations when you do it by hand using the selected style manual (below).
Purdue OWL - Purdue Online Writing Lab - Purdue University
The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material
Research Documentatation, 5th ed. - From authors of style guides in several disciplines, this website provides examples of in-text citations and References lists for Chicago, APA, MLA, etc....