एपीए उद्धरण

Marshak Stphen. (2001). Earth: Portrait of a Planet. American: ADBS.

शिकागो स्टाइल उद्धरण

Marshak Stphen. Earth: Portrait of a Planet. American: ADBS, 2001.

एमएलए उद्धरण

Marshak Stphen. Earth: Portrait of a Planet. American: ADBS, 2001.