Cita APA (7a ed.)

Marshak, S., & Prothero, D. R. (2001). Earth: Portrait of a planet. W. W. Norton.

Cita Chicago Style (17a ed.)

Marshak, Stephen, y Donald R. Prothero. Earth: Portrait of a Planet. New York: W. W. Norton, 2001.

Cita MLA (8a ed.)

Marshak, Stephen, y Donald R. Prothero. Earth: Portrait of a Planet. W. W. Norton, 2001.