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.
This 2010 handbook provides guidance on documenting sources and on writing style. It includes instructions and examples for online publications and websites.
This page explains the system using separate bibliographic notes for citations rather than including them in the text as in often done in science papers.
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. These links go to the 2009 edition. The 2016 edition will be published in April.