एपीए उद्धरण

(2004). Fifty great thinkers on the environment. Routledge.

शिकागो स्टाइल उद्धरण

Fifty Great Thinkers on the Environment. London: Routledge, 2004.

एमएलए उद्धरण

Fifty Great Thinkers on the Environment. Routledge, 2004.