APA

APA Style - official site from APA to accompany APA Style Manual, 6th ed., 2009.   Changes from 5th edition, chapter by chapter

APA Style Lite for College Papersa concise guide to crafting research papers in the style of APA.

APA Reference Style Guide – a comprehensive APA Guide from Northern Michigan University

APA Tutorial --From Southern Mississippi

APA Tutorial to the 6th edition created by Paul Blobaum, M.A., M.S., Associate Professor, Health and Human Services Librarian, University Library Governors State University   

Knowledge Base APA parenthetical (in-text) reference
 

OWL at Purdue Writing and APA Guide

Research and Documentation Online: APA Style -- by Diana Hacker
Style Wizard  

The Writing Center – From University of Wisconsin