APA استشهاد

Anil Kumar De & Arnab Kumar De. Textbook of environmental Science. Scientific International Pvt. Ltd.

استشهاد بنمط شيكاغو

Anil Kumar De و Arnab Kumar De. Textbook of Environmental Science. New Delhi: Scientific International Pvt. Ltd.

MLA استشهاد

Anil Kumar De و Arnab Kumar De. Textbook of Environmental Science. Scientific International Pvt. Ltd.