Cita APA (7th ed.)

Ashley, W. J. (1903). The tariff problem. P. S. King & Son.

Cita Chicago (17th ed.)

Ashley, W. J. The Tariff Problem. London: P. S. King & Son, 1903.

Cita MLA (8th ed.)

Ashley, W. J. The Tariff Problem. P. S. King & Son, 1903.