Cita APA (7a ed.)

Berger, M., & Berger, G. (2003). The real Vikings: Craftsmen, traders, and fearsome raiders. National Geographic.

Cita Chicago Style (17a ed.)

Berger, Melvin, y Gilda Berger. The Real Vikings: Craftsmen, Traders, and Fearsome Raiders. Washington, D.C.: National Geographic, 2003.

Cita MLA (8a ed.)

Berger, Melvin, y Gilda Berger. The Real Vikings: Craftsmen, Traders, and Fearsome Raiders. National Geographic, 2003.

Precaución: Estas citas no son 100% exactas.