Kaufmann, W. (1961). Philosophic classics. Prentice-Hall.
Tohutoru Kātū Chicago (17th ed.)Kaufmann, Walter. Philosophic Classics. Englewood Cliffs, N.J: Prentice-Hall, 1961.
Tohutoro MLA (9th ed.)Kaufmann, Walter. Philosophic Classics. Prentice-Hall, 1961.
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