APA (7th ed.) Citation

Schiller, F. C. S. (1968). Riddles of the sphinx: A study in the philosophy of humanism. Greenwood Press.

Chicago Style (17th ed.) Citation

Schiller, F. C. S. Riddles of the Sphinx: A Study in the Philosophy of Humanism. New York: Greenwood Press, 1968.

MLA (8th ed.) Citation

Schiller, F. C. S. Riddles of the Sphinx: A Study in the Philosophy of Humanism. Greenwood Press, 1968.