Cita APA (7a ed.)

Westermann, W. L. (1955). The slave systems of Greek and Roman antiquity. The American Philosophical Society.

Cita Chicago Style (17a ed.)

Westermann, William L. The Slave Systems of Greek and Roman Antiquity. Philadelphia: The American Philosophical Society, 1955.

Cita MLA (9a ed.)

Westermann, William L. The Slave Systems of Greek and Roman Antiquity. The American Philosophical Society, 1955.