Weniger, D. (1969). Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. University of Texas Press.
Chicago-referens (17:e uppl.)Weniger, Del. Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. Austin: University of Texas Press, 1969.
MLA-referens (9:e uppl.)Weniger, Del. Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. University of Texas Press, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.