Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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