Citazione Stile APA (7a Edizione)

Verma, P. S. (1983). Environmental Biology: Principles of Ecology (1st. ed.). S. Chand & Company Ltd..

Citazione stile Chigago Style (17a edizione)

Verma, P. S. Environmental Biology: Principles of Ecology. 1st. ed. New Delhi: S. Chand & Company Ltd., 1983.

Citatione MLA (9a ed.)

Verma, P. S. Environmental Biology: Principles of Ecology. 1st. ed. S. Chand & Company Ltd., 1983.