APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.