Wasson, Gordon R.: Notes on the Present Status of Ololiuhqui and the Other Hallucinogens of Mexico. Botanical Museum Leaflets, 22.11.1963, nro 6. Harvard University. Artikkelin verkkoversio. (englanniksi)
Hofmann, Albert: Teonanácatl and Ololiuqui, two ancient magic drugs of Mexico. Bulletin on Narcotics, 1971, nro 1. Artikkelin verkkoversio. (englanniksi)