Cita APA (7th ed.)

Wild, J. (1955). The challenge of existentialism. Bloomington Indiana University Press.

Cita Chicago (17th ed.)

Wild, John. The Challenge of Existentialism. Indianápolis: Bloomington Indiana University Press, 1955.

Cita MLA (9th ed.)

Wild, John. The Challenge of Existentialism. Bloomington Indiana University Press, 1955.