Cita APA (7th ed.)

Pourade, R. F., & Copley, J. S. (1960). The explorers. The Union Tribune Publishing.

Cita Chicago (17th ed.)

Pourade, Richard F., i James S. Copley. The Explorers. San Diego: The Union Tribune Publishing, 1960.

Cita MLA (9th ed.)

Pourade, Richard F., i James S. Copley. The Explorers. The Union Tribune Publishing, 1960.