Παραπομπή APA

Johnson, R. E. (1971). Existential man: The challenge of psychotherapy. Pergamon Press.

Παραπομπή Chicago Style

Johnson, Richard E. Existential Man: The Challenge of Psychotherapy. New York: Pergamon Press, 1971.

Παραπομπή MLA

Johnson, Richard E. Existential Man: The Challenge of Psychotherapy. Pergamon Press, 1971.