APA (7th ed.) Citation

Ballard, R. D. (1988). Exploring our living planet (Rev. ed.). National Geographic Society.

Chicago Style (17th ed.) Citation

Ballard, Robert D. Exploring Our Living Planet. Rev. ed. Washington, D.C: National Geographic Society, 1988.

MLA (9th ed.) Citation

Ballard, Robert D. Exploring Our Living Planet. Rev. ed. National Geographic Society, 1988.