एपीए उद्धरण

Singh, G., & Inderjeet Kaur Sethi. (1992). Topics and terms in enviornmental science. Commonwealth.

शिकागो स्टाइल उद्धरण

Singh, Gurcharan, और Inderjeet Kaur Sethi. Topics and Terms in Enviornmental Science. New Delhi: Commonwealth, 1992.

एमएलए उद्धरण

Singh, Gurcharan, और Inderjeet Kaur Sethi. Topics and Terms in Enviornmental Science. Commonwealth, 1992.