APA

Kaushika N., Kaushik K., . (2004). Energy, ecology and environment. New Delhi: Capital publishing company.

Chicago

Kaushika N.D, Kaushik Kshitij, . 2004. Energy, ecology and environment. New Delhi: Capital publishing company.

Harvard

Kaushika N., Kaushik K., . (2004). Energy, ecology and environment. New Delhi: Capital publishing company.

MLA

Kaushika N.D, Kaushik Kshitij, . Energy, ecology and environment. New Delhi: Capital publishing company. 2004.