Cita APA (7th ed.)
HARTLEY, A. B. (1902). The Problem of metaphysics.
Cita Chicago (17th ed.)
HARTLEY, Alexander Burr. The Problem of Metaphysics. New York, 1902.
Cita MLA (9th ed.)
HARTLEY, Alexander Burr. The Problem of Metaphysics. 1902.
Atenció: Aquestes cites poden no estar 100% correctes.