Avery, David F. and Tanner, Wilmer W.
"The osteology and myology of the head and thorax regions of the obesus group of the genus Sauromalus Dumeril (Iguanidae),"
Brigham Young University Science Bulletin, Biological Series: Vol. 5
, Article 1.
Available at: http://scholarsarchive.byu.edu/byuscib/vol5/iss3/1