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David Steindl-Rast, "The Mystical Core of Organized Religion," a classic on the relationship between mysticism and religion. Originally published in New Realities Vol. X No. 4 (March/April 1990): 35-37.
Institute for Mystical Experience Research and Education (IMERE), an organization that collects and publishes mystical experiences from around the world.
Alister Hardy Religious Experience Research Centre (RERC), an organization at the University of Wales, Lampeter, which houses an archive of over 6,000 accounts of spiritual and religious experiences from around the world.