APA (7th ed.) Citation

Marshak, S., & Prothero, D. R. Earth: Portrait of a planet.

Chicago Style (17th ed.) Citation

Marshak, Stephen, and Donald R. Prothero. Earth: Portrait of a Planet.

MLA (8th ed.) Citation

Marshak, Stephen, and Donald R. Prothero. Earth: Portrait of a Planet.

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