APA استشهاد

Tyagi, O., & Mehra, M. (1990). Textbook of environmental chemistry. Anmol Publications.

استشهاد بنمط شيكاغو

Tyagi, O.D, و M. Mehra. Textbook of Environmental Chemistry. New Delhi: Anmol Publications, 1990.

MLA استشهاد

Tyagi, O.D, و M. Mehra. Textbook of Environmental Chemistry. Anmol Publications, 1990.