Every so often, I'm asked how these web pages should be cited. There's no one answer. Opinion and style vary according to whom you ask. The Bedford/St. Martin's web site has a comprehensive web page that presents style guidelines from MLA, APA, University of Chicago, and others, including a set of links to related web pages.

If the Bedford/St. Martin's page were to become unavailable, I recommend using a search engine such as Google to search on "citing web pages" or "citing web sources", with or without quotation marks.