Kumar, H. D. (1990). Modern concepts of ecology (2nd ed.). Vikas Publishing House.
Citazione stile Chigago Style (17a edizione)Kumar, H. D. Modern Concepts of Ecology. 2nd ed. New Delhi: Vikas Publishing House, 1990.
Citatione MLA (9a ed.)Kumar, H. D. Modern Concepts of Ecology. 2nd ed. Vikas Publishing House, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.