एपीए उद्धरण

Ahluwalia, V. K. Environmental studies: Basic concepts. The Energy and Resources Institute.

शिकागो स्टाइल उद्धरण

Ahluwalia, V K. Environmental Studies: Basic Concepts. New Delhi: The Energy and Resources Institute.

एमएलए उद्धरण

Ahluwalia, V K. Environmental Studies: Basic Concepts. The Energy and Resources Institute.