APA (7th ed.) Citation

National Geographic Maps (Firm), Carroll, A., & Giusti, R. (2002). The Inca. The Society.

Chicago Style (17th ed.) Citation

National Geographic Maps (Firm), Allen Carroll, and Roberto Giusti. The Inca. Washington, D.C.: The Society, 2002.

MLA (9th ed.) Citation

National Geographic Maps (Firm), et al. The Inca. The Society, 2002.