APA (7th ed.) Citation

Wolff, R. P. (1992). About philosophy (5th ed.). Prentice Hall.

Chicago Style (17th ed.) Citation

Wolff, Robert Paul. About Philosophy. 5th ed. Englewood Cliffs, N.J.: Prentice Hall, 1992.

MLA (9th ed.) Citation

Wolff, Robert Paul. About Philosophy. 5th ed. Prentice Hall, 1992.