Björkqvist, Kaj (1981): «Ecstasy from a Physiological Point of View»Arkivert 14. september 2004 hos Wayback Machine. i: Scripta Instituti Donneriani Aboensis XI: Religious Ecstasy. Based on Papers read at the Symposium on Religions Ecstasy held at Åbo, Finland, on the 26th-28th of August 1981. Redigert av Nils G. Holm.
Björkqvist, Kaj (1981): «Ecstasy from a Physiological Point of View»Arkivert 14. september 2004 hos Wayback Machine. i: Scripta Instituti Donneriani Aboensis XI: Religious Ecstasy. Based on Papers read at the Symposium on Religions Ecstasy held at Åbo, Finland, on the 26th-28th of August 1981. Redigert av Nils G. Holm.