The APA Style website provides an overview of information regarding in-text citations of electronic material on the Basic Principles of Citation page.
The Purdue OWL website also maintains a list of helpful tips for citing various electronic sources.
The general rule for citing Web pages in APA format is to include as much information as possible. If there is no date available, use (n.d.), which stands for "no date". More information about electronic sources is available on the Purdue OWL site.
Author's Last Name, Author's First Initial. Author's Middle Initial. (Year, Month Day
of publication). Title of document. http://www.xxxxxxxx
Doctorow, C. (2009, August 13). Photos of science fiction writers' nests. http://www.boingboing.net/2009/08/13/photos-of-science-fi.html
When there is no author for a Web page, the title of the page takes the place of the author and is listed first. If there is no date available, use (n.d.), which stands for "no date". If the website URL you are citing runs onto the next line, be sure to break the address after a "/" (http:// is an exception).
Title of document. (Year, Month, Day). http://www.xxxxxxx
Example:
Tenn. couple accused of assault using Cheetos. (2009, June 27). http://www.msnbc.msn.com/id/31580100/ns/
us_news-weird_news/