एपीए उद्धरण

(1974). Planet earth: Readings from scientific American. W H Freeman.

शिकागो स्टाइल उद्धरण

Planet Earth: Readings from Scientific American. Sanfrancisco: W H Freeman, 1974.

एमएलए उद्धरण

Planet Earth: Readings from Scientific American. W H Freeman, 1974.