Katherine A MacLean, Matthew W Johnson, Roland R Griffiths. Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness (англ.) // Psychopharmacology[англ.] : journal. — Springer, 2011. — November (vol. 25, no. 11). — P. 1453—1461. — doi:10.1177/0269881111420188.
Katherine A MacLean, Matthew W Johnson, Roland R Griffiths. Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness (англ.) // Psychopharmacology[англ.] : journal. — Springer, 2011. — November (vol. 25, no. 11). — P. 1453—1461. — doi:10.1177/0269881111420188.