1969. The Cacti of Arizona. 3ª ed. U.Arizona, Tucson. 218 pages. ISBN 0-8165-0509-8 1969. The Native Cacti of California. Ed. Stan. U, Stanford. 243 pages...
Benson, L. (1981). The Cacti of Arizona. University of Arizona Press. ISBN 0816505098. Drezner TD (2005) Saguaro (Carnegiea gigantea, Cactaceae) growth rate...