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Crossref.org — find complete book and article citations by keywords, title, author, ISSN, ISBN, or DOI. Contains tools for generating citations in a variety of formats (APA, MLA, Chicago/Turabian, IEEE and more)
DOI.org — the Digital Object Identifier (DOI) system provides a technical and social infrastructure for the registration and use of persistent interoperable identifiers, called DOIs, for use on digital networks
EasyBib — free automatic bibliography and citation generator for MLA format only
Guide to Grammar and Writing — improve grammar, syntax, punctuation, sentence & paragraph structure and more with instructional quizzes & tutorials
IEEE Author Center — includes Author Tools for publishing and managing references in IEEE format