Easy Bib: Generates free citations in MLA style. Subscribers can generate citations in APA, Chicago, and more.
KnightCite Citation Service: Generates citations in MLA, APA, and Chicago styles.
OWL (Purdue University Online Writing Lab): Provides information to assist with writing projects, such as grammar, punctuation, mechanics, research, and citation guides.
Chicago Citation Basics (.pdf): This guide, published by EasyBib, walks you through the components of Chicago style citations for many types of resources.