Schultes, Richard Evans. “ETHNOPHARMACOLOGICAL CONSERVATION IN SOUTH AMERICA: A KEY TO PROGRESS IN MEDICINE”. Revista De La Academia Colombiana De Ciencias Exactas, Físicas Y Naturales, vol. 17, no. 64, Dec. 1989, pp. 71-78, https://doi.org/10.18257/raccefyn.17(64).1989.3674.