Tohutoro APA (7th ed.)
Grassian, V. (1984). Perennial philosophical issues. Prentice hall.
Tohutoru Kātū Chicago (17th ed.)
Grassian, Victor. Perennial Philosophical Issues. New Jersey: Prentice hall, 1984.
Tohutoro MLA (9th ed.)
Grassian, Victor. Perennial Philosophical Issues. Prentice hall, 1984.
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