This 2017 edition of the handbook provides guidance on documenting sources and on writing style. It includes instructions and examples for citing online publications and websites as well as other non-print sources.
This page gives extensive examples for different kinds of sources.
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.
Zotero: A How-To Guide Tricollege guide for using Zotero. Starts with an introduction and installation before describing how to use if as a versatile tool for research, footnotes and bibliographies.