The best way to cite a website you use in your project is this:
Author [if known]. "Title" [main title, in italics, if applicable]. Last
date updated or revised [if known]. URL (web address) of page. (Date page was accessed).
For example, this website, http://www.bbc.co.uk/dna/h2g2/A13856970,
the citation would be
"Tenochtitlan- Island City of the
Aztecs". November 15, 2006.
http://www.bbc.co.uk/dna/h2g2/A13856970.
October 24, 2008.