APA (7th ed.) Citation

Keen, E. (1970). Three faces of being: Toward an existential clinical psychology. Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Keen, Ernest. Three Faces of Being: Toward an Existential Clinical Psychology. New York: Appleton-Century-Crofts, 1970.

MLA (9th ed.) Citation

Keen, Ernest. Three Faces of Being: Toward an Existential Clinical Psychology. Appleton-Century-Crofts, 1970.