1. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: Author.
2. Arbman, E. (1963, 1968). Ecstasy or religious trance: In the experience of the ecstatics and from the scientific point of view (Vols. 1-3). Stockholm: Svenska Bokforlaget.
3. Buber, M. (1985). Ecstatic confessions [E. Cameron, Trans.]. New York: Harper &Row.
4. Erikson, E. H. (1963). Childhood and society. New York: Norton.