TUPPER, Kenneth. Entheogens and Existential Intelligence: The Use of Plant Teachers as Cognitive Tools. Canadian Journal of Education/Revue canadienne de l’éducation, [S. l.], v. 27, n. 4, p. 499–516, 2002. Disponível em: https://journals.sfu.ca/cje/index.php/cje-rce/article/view/2843. Acesso em: 3 may. 2024.