UNC University Libraries One of the best citation websites on the web.
OWL-Purdue University Perhaps the best online resource for APA, MLA and writing form examples, the Online Writing Lab at Purdue University provides extensive citation examples and writing tutorials.
Citing Sources and Avoiding Plagiarism from Duke University includes APA, Turabian, MLA, Chicago for print and online resources and sections on citing sources within your paper and assembling a list of works cited.
Differences Between MLA, APA and Chicago formats a great, explanatory table by Winston-Salem State University.
Citation Style for Research Papers From Long Island University, APA, MLA, Chicago/Turabian and AMA examples.
Citation Style for Citing Internet Sources Shows you how to format Internet sources in MLA, APA and Chicago standards.
Dartmouth Writing Program contains a number of helpful materials, such as some well-written essays that answer the question "What is an academic paper?" and also provide information on researching topics for papers. The site also includes information on such topics as writing about film, music, sociology courses, and examples of citing sources in APA, MLA and Science.
Cite Source Cite source is an awesome site that breaks down citations step-by-step.