1. Rerum Medicarum Novae Hispaniae Thesaurus seu Plantarum, Animalium, Mineralium Mexicanorum Historia;Hernández,1651
2. Organic Materia Medica;Davis,1890
3. Potter's New Encyclopedia of Botanical Drugs and Preparations;Wren,1970
4. Atlas of Medicinal Plants of Middle America;Morton,1981
5. Flora of Puerto Rico and Adjacent Islands: A Systematic Synopsis;Liogier,1982