Verbatim text: Anderson, E. F. 1987. A revision of the genus Thelocactus B. & R. (Cactaceae). Bradleya 5: 49–76.
Author: Anderson, E.F.
Year: 1987
Title: A revision of the genus Thelocactus B. & R. (Cactaceae)
Journal: Bradleya
Volume: 5
Pages: 49–76