APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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