Weniger, D. (1969). Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. University of Texas Press.

Weniger, Del. Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. Austin: University of Texas Press, 1969.

Weniger, Del. Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. University of Texas Press, 1969.