APA (7th ed.) Citation

Anspacher, L. K. (1947). Challenge of the unknown: Exploring the psychic world. Current Books.

Chicago Style (17th ed.) Citation

Anspacher, Louis Kaufman. Challenge of the Unknown: Exploring the Psychic World. New York: Current Books, 1947.

MLA (8th ed.) Citation

Anspacher, Louis Kaufman. Challenge of the Unknown: Exploring the Psychic World. Current Books, 1947.

Warning: These citations may not always be 100% accurate.