1. Drugs and Foods from Little-Known Plants: Notes in the Harvard University Herbaria;Altschul,1973
2. Poisonous Plants of Venezuela;Blohm,1962
3. Human Poisoning from Native and Cultivated Plants;Hardin,1969
4. Plantas Útiles de la Flora Mexicana;Martínez,1959
5. Las Plantas Medicinales de México;Martínez,1962