एपीए उद्धरण

Hill, M. k. (2004). Understanding environmental pollution (2nd ed.). Cambridge.

शिकागो स्टाइल उद्धरण

Hill, Marquita k. Understanding Environmental Pollution. 2nd ed. New Delhi: Cambridge, 2004.

एमएलए उद्धरण

Hill, Marquita k. Understanding Environmental Pollution. 2nd ed. Cambridge, 2004.