Pediocactus knowltonii
Roth, D. 2013. Pediocactus knowltonii (Knowlton's Cactus), summary report. Submitted U.S. Fish and Wildlife Service, Section 6, Segment 27. 25.
Sivinski, R. 2004. Knowlton's Cactus (Pediocactus knowltonii): Progress Report. New Mexico Forestry Division; Santa Fe, New Mexico. 13 p.
Sivinski, R. 1996. Section 6, segment 10 annual report of botanical work accomplished by NM Forestry and Natural Resources Dept. for Fish and Wildlife Service, Albuquerque, NM.
Roth, D. 2012. Pediocactus knowltonii (Knowlton's cactus): 2012 status report. Santa Fe, NM: NM Energy, Minerals and Natural Resources Department - Forestry Division; Report E-9-26 to U.S. Fish and Wildlife Service. 25p.
Sivinski, R. 1991. Annual Section 6 performance report monitoring endangered plants (job 1). Unpublished report for U.S. Fish and Wildlife Service, Albuquerque, NM. 135 p + maps.
Knight, P. Marron and Associates Inc., 7511 Fourth Street, Albuquerque, NM 87107-6629 (505) 898-8848
Sivinski, R. 2001. Endangered Plant Study. Sante Fe, NM: New Mexico Forestry Division; Performance and Progress Report E-9-15. 245p.
Heil, K.D. 1985. Recovery plan for the Knowlton cactus Pediocactus knowltonii L. Benson. Prepared for the U.S. Fish and Wildlife Service, Region 2. Albuquerque, NM. 59 pp.
Glenne, G. and E. Mayo. 2009. Field survey form for Knowlton cactus (Pediocactus knowltonii). 4 p.
Stafford, R. 1989. Botanists find cactus better neighborhood. Plant Conservation 4(1): 3.