Here's the citation as it was generated for me when I followed the previous poster's instructions:

"Mulatto: Introduction." Drama for Students. Ed. Marie Rose Napierkowski. Vol. 18. Detroit: Gale, 1998. eNotes.com. January 2006. 3 November 2009. <http://www.enotes.com/mulatto/introduction>.

This particular citation is in MLA format and includes, just before the URL, two dates. The first date (not always given) is the date that the material was published to the internet. The second date is the date that you accessed the information.

Hi,

If you look at the top of every page, there is a toolbar which has print, PDF, and also "cite this page". Click that, and it will create a citation for you that you can copy and paste.