Citazione Stile APA (7a Edizione)

Gopal, B., & Bhardwaj, N. (1979). Elements of ecology. Vikas Publishing House Pvt. Ltd..

Citazione stile Chigago Style (17a edizione)

Gopal, Brij, e N. Bhardwaj. Elements of Ecology. New Delhi: Vikas Publishing House Pvt. Ltd., 1979.

Citatione MLA (9a ed.)

Gopal, Brij, e N. Bhardwaj. Elements of Ecology. Vikas Publishing House Pvt. Ltd., 1979.