January 2003
Benson, L. (1982): The cacti of the United States and Canada. Stanford Univ. Press, Pasadena, California.
Heil, K. D., B. Armstrong, and D. Schleser (1981): a review of the genus Pediocactus. Cact. Succ. J. (US) 53:17-39.
Heil, K. D. and J. M. Porter (1994): Sclerocactus (Cactaceae): a revision. Haseltonia 2:20-46.
Heil, K. D., J. M. Porter, and M. S. Kinney (2000): Relationships between Sclerocactus and Toumeya (Cactaceae) based on chloroplast TRNL-TRNF sequences. Haseltonia 7:8-23.
Hochstätter, F. (1990): Revision Pediocactus simpsonii I.-III. Succulenta, Netherlands 70 (7/8):169-176, 70 (9): front cover, 178-183, 70 (12): 269-270.
Hochstätter, F. (1992): Revision Sclerocactus (Cactaceae) I. Succulenta, Netherlands 72 (6):247-262.
Hochstätter, F. (1993): Revision Sclerocactus (Cacataceae) II.-V. Succulenta, Netherlands 73 (1): front cover, 19-34, 73 (2):82-92, 73 (3):137-140, 73 (4):187-191.
Hochstätter, F. (1993): The genus Sclerocactus (Cactaceae) - Revised. Selbstverlag.
Hochstätter, F. (1995): The Genera Pediocactus, Navajoa, Toumeya (Cactaceae) - Revised. Selbstverlag.
Hochstätter, F. (1998): Revision of Sclerocactus parviflorus and its infraspecific taxa I. Cactaceae-Reviw IRT 1 (1):4-19.
Hochstätter, F. (1999): Revisione di Sclerocactus parviflorus e dei suoi taxa infraspecific. Piante Grasse, Italy. Front cover, 19 (1):2-19.
Hochstätter, F. (1999): The infrageneric taxa (sections) of the genus Pediocactus. Cactaceae-Review IRT 2 (2):14.
Hochstätter, F. (2002): Documentation of nomenclature Tribe Cacteae Sclerocactus Britton & Rose (Cactaceae) I. - Cactaceae-Review IRT. 5 (1): 15-17.
Hochstätter, F. (2002): Documentation of nomenclature Tribe Cacteae Sclerocactus Britton & Rose (Cactaceae) II. - Cactaceae-Review IRT. 5 (2): 15-19.
Hochstätter, F. (2003): Documentation of nomenclature Tribe Cacteae Pediocactus Britton & Rose (Cactaceae) I. - Cactaceae-Review IRT. 6 (1):15-19.
