APA (7th ed.) Citation

(2003). Planet earth: Discover and understand our world's natural wonders. Britannica.

Chicago Style (17th ed.) Citation

Planet Earth: Discover and Understand Our World's Natural Wonders. Chicago: Britannica, 2003.

MLA (9th ed.) Citation

Planet Earth: Discover and Understand Our World's Natural Wonders. Britannica, 2003.

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