APA (7th ed.) Zitazioa

Roberts, K. (1937). Northwest passage. Fawcett Publications.

Chicago Style (17th ed.) Zitazioa

Roberts, Kenneth. Northwest Passage. Greenwich: Fawcett Publications, 1937.

MLA (9th ed.) Zitazioa

Roberts, Kenneth. Northwest Passage. Fawcett Publications, 1937.