APA (7th ed.) Citation

Wolff, R. P. (1981). About philosophy (2nd ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Wolff, Robert Paul. About Philosophy. 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, 1981.

MLA (9th ed.) Citation

Wolff, Robert Paul. About Philosophy. 2nd ed. Prentice-Hall, 1981.

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