Columbia subject headings:
Astral projection.
Ecstasy.
Experience (Religion)
Spirits.
Trance.
Visions.
Harvard subject headings:
Astral projection--Case studies.
Astral projection.
Posture in worship--Case studies.
Posture--Miscellanea.
Religion
Shamanism--Case studies.
Shamanism.
Trance
Trance--Case studies.
Princeton subject headings: