The Jacobson Center for Writing, Teaching and Learning offers individual help with writing and also this useful guide:
Writing Papers: A Handbook for Students at Smith College
Read "When to Cite" starting on page 52 (pg. 60 of 80 in pdf file).
Zotero is a free research tool that allows you to easily organize references, create in-text citations and bibliographies, and much, much more!
Learn more at Zotero.org or visit the Smith Libraries guide to Zotero.