Purdue University's Online Writing Lab (OWL) is an organized, user-friendly resource for MLA style guidelines.
EasyBib Citation management software helps you create and manipulate citations in a variety of formats.
Zotero A powerful bibliographical tool available as a Firefox add-on, free of charge.
I Need to . . . Cite My Source Valuable resource from the Oregon School Library Information System enables users to build APA and MLA citations.
Son of Citation Machine This site is extremely useful for citing sources, but be sure to double-check that all sources are formatted correctly, as the formatting is not always completely perfect.
APA Style Blog: How to Create a Reference for a YouTube Video
Be aware that some instructors may have additional or specialized requirements for your citations.