Cita APA (7th ed.)

O'Callaghan, S. (1961). The slave trade. A. Blond.

Cita Chicago (17th ed.)

O'Callaghan, Sean. The Slave Trade. London: A. Blond, 1961.

Cita MLA (8th ed.)

O'Callaghan, Sean. The Slave Trade. A. Blond, 1961.