APA aipamena

Sanjan Kumar. Environment and ecology: Highly useful for UPSC and state PCS exams. Arihant publications.

Chicago Style aipamena

Sanjan Kumar. Environment and Ecology: Highly Useful for UPSC and State PCS Exams. Meerut: Arihant publications.

MLA aipamena

Sanjan Kumar. Environment and Ecology: Highly Useful for UPSC and State PCS Exams. Arihant publications.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.