Firstly, the verb you're looking for is not "site" but instead its homonym. That being said, there are a number of sweet websites out there that will tell you how to perform citations in any of the major formats. Among them is citationmachine.net .
Usually, one uses the author of the page or the website's title. For example, "(John Doe)" or "(The New York Times)". Be wary of occasions wherein the same website has multiple articles that you're citing, though.