Tohutoro APA (7th ed.)
HARTLEY, A. B. (1902). The Problem of metaphysics.
Tohutoru Kātū Chicago (17th ed.)
HARTLEY, Alexander Burr. The Problem of Metaphysics. New York, 1902.
Tohutoro MLA (9th ed.)
HARTLEY, Alexander Burr. The Problem of Metaphysics. 1902.
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