Wiki

Wiki name. Year. Title of article. [Online]. [Date accessed]. Available from: URL

Example:

Wikipedia. 2007. Socrates. [Online]. [Accessed 23 January 2007]. Available from: http://en.wikipedia.org/w/index.php?title=Socrates action=history

When you are creating the in-text citation, use the name of the wiki as the author (a corporate author).