This is a fabulous resource!!  I love the module format for it.  

Please read over the citation instructions on their web site:

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Citing this Site

A number of useful citation formats for web resources can be found on the "Frequently Asked Reference Questions" page of the Internet Public Library website. In general you should include author, publication date, page title, title of the site, date you viewed the site, and the url. In APA format a citation of one of our resources might look like this:

Macdonald, H. (2004) Geologic Puzzles: Morrison Formation, Starting Point. Retrieved Sept 9, 2004, from http://serc.carleton.edu/introgeo/interactive/examples/morrisonpuzzle.html

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