WebMO Help - Citing WebMO

What is the recommended citation for WebMO?

Schmidt, J.R.; Polik, W.F. WebMO Enterprise, version .0; WebMO LLC: Holland, MI, USA, 20; http://www.webmo.net (accessed March, 20).

Adjust the version number and years appropriately. State "WebMO Enterprise", "WebMO Pro", or "WebMO" to reflect the level of software you are using (you can check your version from the log-in screen). You are using "WebMO Enterprise" if the version number ends in "e", "WebMO Pro" if the version ends in "p", or "WebMO" if the version number does not end in a letter.