If you need to give information about this site in an essay, you will find this information on the first page:

This site originally published in February 1999. Most recent update November 2005. Written by Michael Best. © Internet Shakespeare Editions 1999-2010.

You will find out more about the author by clicking on the link.

To cite a page you have used, the standard format would be like this (for this page):

Best, Michael. "Citing this site." Internet Shakespeare Editions, University of Victoria: Victoria, BC, 2001-2010. <http://internetshakespeare.uvic.ca/Library/SLT/help/introcite.html>. Accessed [enter the date you visited this page].

The site as a whole would appear thus:

Best, Michael. Internet Shakespeare Editions, University of Victoria: Victoria, BC, 2001-2010. <<http://internetshakespeare.uvic.ca/>. Accessed [enter the date you visited the site].

A passage from a play would appear in this format:

Shakespeare, William. [The name of the play]. [The name of the editor], ed. Internet Shakespeare Editions, University of Victoria: Victoria, BC, [the date of publication on the title page of the play]. <http://internetshakespeare.uvic.ca/>. Accessed [enter the date you visited the site].