APA (7th ed.) Citation

Wolff, R. P. (1971). Philosophy: A modern encounter. Prentice-Hall.

Chicago Style (17th ed.) Citation

Wolff, Robert Paul. Philosophy: A Modern Encounter. Englewood Cliffs, N.J.: Prentice-Hall, 1971.

MLA (8th ed.) Citation

Wolff, Robert Paul. Philosophy: A Modern Encounter. Prentice-Hall, 1971.