एपीए उद्धरण

Ranjan Kumar. Environment and ecology. Arihant Publications(India) Ltd.

शिकागो स्टाइल उद्धरण

Ranjan Kumar. Environment and Ecology. India: Arihant Publications(India) Ltd.

एमएलए उद्धरण

Ranjan Kumar. Environment and Ecology. Arihant Publications(India) Ltd.