Greenberg, Neil.; MacLean, Paul.(Rockville, Md. : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Alcohol, Drug Abuse, and Mental Health Administration, National Institute of Mental Health, 1978)
Flores Villela, Oscar Alberto; Gerez Fernández, Patricia(México, D.F. : Universidad Nacional Autónoma de México ; Comisión Nacional para el Conocimiento y Uso Biodiversidad,, 1994)