Alvarez, Angel G. 1971  Boletín Metereológico del Estado de Chihuahua.  Compendio 1957 a 1961.  Servicio Metereológico del    Estado.  Boletín No.10 244 p.

Brown, David E. 1983.  The Wolf in the southwest.  The making of an endangered species.  The University of Arizona Press. Tucson,       Az. 195p.

Cotecoca, 1978.  Tipos de vegetación, sitios de productividad forrajera y coeficientes de agostadero del Estado de Chihuahua.  Subsecrtaría de Ganadería, SARH.  México, D. F.,130p.

Gish, Dan An Historic look at the Mexican Gray Wolf in early Arizona Territory since statehood:  A review of available documentation and personal records.  204 p. Inédito.

Leopold, A. Starker. 1965.  Fauna silvestre de México.  Aves y mamíferos de caza.  Instituto Mexicano de Recursos Naturales Renovables.  México, D. F., pp.453-460.

McBride, Roy T. 1980.  The Mexican Wolf. A Historical review and observation on it's status and distribution.  Curtis J. Carley and Sharon Wehrle editors.  U.S. Fish and Wildlife Service. Endangered species report No. 8  38p.

Nunley, Bary L. 1977  The Mexican Gray Wolf in New Mexico.  Animal damage control.  Albuquerque, N.M. 80p.

Scudday, James F.  The Mexican Wolf in Texas.  15p.  Inédito.

Treviño, Jose C. 1981.  Status of the Mexican Wolf and grizzly bear in northern Mexico. In wildlife and range research needs in northern Mexico and southwestern United States:  Workshop      preceeding. Rio Rico, Arizona, U.S.A. Forest Service. General and techical report WO-36 pp. 78-80.

U.S. Fish and Wildlife Service, 1993.  Status report for Mexican Wolf recovery program (January - May 1993).  U.S. Dept. of the Interior,  U.S.A.F.W.S.  Albuquerque, N.M.  5p.

U.S. Fish and Wildlife Service 1993.  The Mexican Wolf natural history and recovery efforts (March 1, 1993).  U.S.F.W.S. Albuquerque, N.M.  2p.

Villa, Bernardo R. 1960.  Combate contra coyotes y lobos en el Norte de Mexico.  An Inst. Biol. UNAM  31:  463-499.