Zevic, Mishor; Ward, Christopher J.; Leuenberger, Daniel (2015). Manual of Psychedelic Support(PDF). Psychedelic Care Publications. pp. 293, 301. ISBN978-0-646-91889-1. Archived(PDF) from the original on 2022-05-25. Retrieved 2023-07-14.
Bergeron, Tiffany (23 August 2018). "Expanding consciousness". Boulder Weekly. Archived from the original on 6 July 2022. Retrieved 14 July 2023.
Zevic, Mishor; Ward, Christopher J.; Leuenberger, Daniel (2015). Manual of Psychedelic Support(PDF). Psychedelic Care Publications. pp. 293, 301. ISBN978-0-646-91889-1. Archived(PDF) from the original on 2022-05-25. Retrieved 2023-07-14.