APA (7th ed.) Citation

National Geographic Maps (Firm) & Carroll, A. (2002). State of the planet, a world transformed ; Challenges for humanity, a thirsty planet. The Society.

Chicago Style (17th ed.) Citation

National Geographic Maps (Firm) and Allen Carroll. State of the Planet, a World Transformed ; Challenges for Humanity, a Thirsty Planet. Washington, D.C.: The Society, 2002.

MLA (9th ed.) Citation

National Geographic Maps (Firm) and Allen Carroll. State of the Planet, a World Transformed ; Challenges for Humanity, a Thirsty Planet. The Society, 2002.