I have been asked how best to cite Randomization.com in reports and manuscripts. I wish I knew!

According to examples in the Citation Guide at the University of Alberta,"No reference entry is needed; give the URL of the site in text." For example,

The randomization scheme was generated by using the Web site Randomization.com ⟨http://www.randomization.com⟩.

online! a reference guide to using internet sources summarizes the guidelines from MLA style, APA style, Chicago style, and CBE style. They uniformly recommend providing as much information as possible, including

• Author: Gerard E. Dallal, Ph.D.
• Version number or any other identifying information: There is a "date last modified" at the bottom of every page. However, that refers to cosmetics only. As stated on the Randomization.com home page, the algorithms have never changed and, if they were to change (even due to error), this would be clearly documented on the home page of the website and all versions would continue to be available.
• Date of electronic publication or posting or latest update, whichever is most recent: See previous entry.
• Name of any organization sponsoring or associated with the Web site: Randomization.com
• Date the website was accessed
• URL in angle brackets: ⟨http://www.randomization.com⟩