The rattlesnakes, genera Sistrurus and Crotalus. :
A study in zoogeography and evolution.
APA Citation
Gloyd, H. K. (Howard Kay). (1940). The rattlesnakes, genera Sistrurus and Crotalus.: A study in zoogeography and evolution. Chicago.
MLA Citation
Gloyd, Howard K. (Howard Kay), 1902-1978. The Rattlesnakes, Genera Sistrurus And Crotalus.: A Study In Zoogeography And Evolution. Chicago, 1940.
Warning: These citations may not always be complete (especially for serials).