APA (7th ed.) Citation
Wolff, R. P. (1998). About philosophy (7th ed.). Prentice hall.
Chicago Style (17th ed.) Citation
Wolff, Robert Paul. About Philosophy. 7th ed. New jersey: Prentice hall, 1998.
MLA (9th ed.) Citation
Wolff, Robert Paul. About Philosophy. 7th ed. Prentice hall, 1998.
Warning: These citations may not always be 100% accurate.