1. Naranjo, Claudio. 1965. Psychological aspects of the yajé experience in an experimental setting. Paper presented at the Annual Meeting of the American Anthropological Association, Boulder.
2. Reichel-Dolmatoff, G. 1968. Desana: simbolismo de los Indios Tukano del Vaupés. Publicaciones del Depto. de Antropología, Universidad de los Andes, Bogotá.
3. Schultes, Richard Evans. 1957. The identity of the malpighiaceous narcotics of South America. Botanical Museum Leaflets, Vol. 18, No. 1, Harvard University, Cambridge.
4. Uscátegui, Nestor. 1959. The present distribution of narcotics and stimulants amongst the Indian tribes of Colombia. Botanical Museum Leaflets, Vol. 18, No. 6, Harvard University, Cambridge.