If you are looking for literature related to psychedelics please browse the following items that might be of interest.

Books

• Pollan, Michael. How to change your mind: What the new science of psychedelics teaches us about consciousness, dying, addiction, depression, and transcendence. Penguin Books, 2019.
• Grof, Stanislav. LSD: Doorway to the numinous: The groundbreaking psychedelic research into realms of the human unconscious. Simon and Schuster, 2009.

Articles

• Griffiths, Roland R., et al. “Mystical-type experiences occasioned by psilocybin mediate the attribution of personal meaning and spiritual significance 14 months later.” Journal of psychopharmacology 22.6 (2008): 621-632.
• Carhart-Harris, Robin L., et al. “Neural correlates of the psychedelic state as determined by fMRI studies with psilocybin.” Proceedings of the National Academy of Sciences 109.6 (2012): 2138-2143.