Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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