Marshak, S., & Prothero, D. R. (2001). Earth: Portrait of a planet. New York: Norton.
Čikaški stil citiranjaMarshak, Stephen, i Donald R. Prothero. Earth: Portrait of a Planet. New York: Norton, 2001.
MLA način citiranjaMarshak, Stephen, i Donald R. Prothero. Earth: Portrait of a Planet. New York: Norton, 2001.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.