A Few Resources
Plagiarism (at Indiana)- Good information on acceptable and unacceptable paraphrasing
Guide to Citation Styles - (The Writing Center at UW-Madison) - An extensive overview of all the major citation styles.
Chicago Manual of Style Online -- The system most commonly used by historians.
Turabian Style Guide -- similar to Chicago, also frequently used by historians
Style Guide Tutorials (at USM)- General guide to citations. An internal link discusses in text citations, but you'll need Acrobat to read it.
The OWL at Purdue: An online writing lab. Extensive resources for aid in writing many kinds of paper. Includes information about citations styles.