The MLA's Handbook is a standard source for advice on formatting and documenting research in literature studies; it contains useful information on all matters pertaining to writing papers.
Resources "that address questions about using and documenting sources; avoiding plagiarism; writing in the disciplines; grammar, style, and punctuation; and other aspects of writing."
Citation Manager
Zotero: The Tri-College Libraries recommend Zotero, a free online app that can format your bibliography, keep your citations organized, and even save your articles in the cloud so you can access them later from the library, home, or a café.
MLA Handbook for Writers of Research Papers