Felger, Richard S., M.V.H. Wilson, B.T. Burns, K. Dahl, Robert H. Nelson, M. Fishbein, Y. Petryzsyn, et al. “Northern Sierra Madre Occidental and its Apachian outliers: A neglected center of Biodiversity.” Gen. Tech. Rep. RM-GTR-264. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. 669 p., edited by Leonard H. DeBano, Peter H. Ffolliott, Alfredo Ortega-Rubio, Gerald J. Gottfried, Robert H. Hamre, and Carleton B. Edminster, 264: 370–378. Tucson, Arizona, U.S.A.: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 264, 370–378.