Texas
Texas Parks and Wildlife Dept., Resource Protection Division. 1991. Endangered resources annual status report. Texas Parks and Wildlife Department, Austin, TX, 45 pp + appendices.
U.S. Fish and Wildlife Service (USFWS). 1985. Proposal to determine Hymenoxys texana to be an endangered species. Federal Register 50(44): 9095-9097.
Neville, T. 2003. In-house DVD for World Wildlife Fund Projects: Peloncillo 2001 and Rio Grande 2003.
Gould, F.W. 1975. The grasses of Texas. Texas A & M Univ. Press, College Station, TX. 653 pp.
Zimmerman, A.D. 1985. Systematics of the genus Coryphantha (Cactaceae). Austin, TX: University of Texas. Dissertation.
Dunn, W.C. and B.T. Milne. 2014. Implications of climatic heterogeneity for conservation of the Lesser Prairie-Chicken (Tympanuchus pallidicinctus). Ecosphere 5(5):1–17.
Bryan, A.M., R.G. Black, and M.M. Manion. 2000. Draft economic analysis of critical habitat designation for the piping plover: Wintering habitat. Division of Economics; U.S. Fish and Wildlife Service. Arlington, Virginia. 59 p.
Rosmarino, Nicole. 2004. Lesser prairie-chicken: the sky really is falling. Forest Guardians.. 22 p.