An on-line guide (key) to the New World scarab genera. Edited by Brett Ratcliffe and Mary Liz Jameson, this is the product of a number of collaborators. A citation to the work as a whole should be of the form:
B.C. Ratcliffe and M.L. Jameson (eds.), Generic Guide to New World Scarab Beetles (URL: http://unsm-ento.unl.edu/Guide/Guide-introduction/Guideintro.html), but see the citation page for examples of citation to individual parts of the work.

Link updated and editorial notes updated 24 March 2010; and again 26 September 2020.