Verbatim text: Hochstätter, F. 1997. The genus Sclerocactus (Cactaceae)—Part 4. Cact. Succ. J. Gr. Brit. 15: 74–81.
Author: Hochstätter, F.
Year: 1997
Title: The genus Sclerocactus (Cactaceae)—Part 4
Journal: Cact. Succ. J. Gr. Brit
Volume: 15
Pages: 74–81