Wolff, R. P. (1998). About philosophy (7th ed.). Prentice hall.
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Chicago Style (17th ed.) Citation
Wolff, Robert Paul. About Philosophy. 7th ed. New jersey: Prentice hall, 1998.
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MLA引文
Wolff, Robert Paul. About Philosophy. 7th ed. Prentice hall, 1998.
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警告：這些引文格式不一定是100％准確.