Cita APA (7a ed.)

Roberts, K. (1966). Northwest passage. Fawcet Crest.

Cita Chicago Style (17a ed.)

Roberts, Kenneth. Northwest Passage. New York, Estados Unidos: Fawcet Crest, 1966.

Cita MLA (9a ed.)

Roberts, Kenneth. Northwest Passage. Fawcet Crest, 1966.