एपीए उद्धरण

Singh, G. .. N. (1991). Environmental Economics. Mittal.

शिकागो स्टाइल उद्धरण

Singh, Ghanshyam . N. Environmental Economics. New Delhi: Mittal, 1991.

एमएलए उद्धरण

Singh, Ghanshyam . N. Environmental Economics. Mittal, 1991.