APA-referens

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

Chicago-stil citat

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

MLA-referens

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

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.