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.