Kaufmann, W. A. (1968). Philosophic classics (2d ed.). Englewood Cliffs, N.J.,: Prentice-Hall.
Trích dẫn kiểu ChicagoKaufmann, Walter Arnold. Philosophic Classics. 2d ed. Englewood Cliffs, N.J.,: Prentice-Hall, 1968.
Deismireacht MLAKaufmann, Walter Arnold. Philosophic Classics. 2d ed. Englewood Cliffs, N.J.,: Prentice-Hall, 1968.
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