↑(en) Beatriz Caiuby Labate et Henrik Jungaberle, The Internationalization of Ayahuasca, Zurich, LIT Verlag Münster, , 446 p. (ISBN978-3-643-90148-4, lire en ligne), "Since its creation by José Gabriel da Costa (Mestre Gabriel) on July 22nd, 1961, the UDV has had the principle of working toward the evolution of humanity in the sense of its spiritual, moral and intellectual development." p. 277
↑(en) Beatriz Caiuby Labate et Gustavo Pacheco, Opening the Portals of Heaven : Brazilian Ayahuasca Music, LIT Verlag Münster, , 108 p. (ISBN978-3-643-10802-9, lire en ligne), "UNIÃO DO VEGETAL The União do Vegetal was founded by José Gabriel da Costa, Mestre Gabriel, born in Coração de Maria, near the city of Feira de Santana, in the state of Bahia, in 1922." p. 51
↑(en) Grob, Charles S. et al., « Human Psychopharmacology of Hoasca, A Plant Hallucinogen Used in Ritual Context in Brazil », The Journal of Nervous & Mental Disease, vol. 184, no 2, , p. 86-94 (ISSN0022-3018, 10.1097/00005053-199602000-00004)