Παραπομπή APA

Krishna Gopal. (2003). River pollution in India and its manangement. APH.

Παραπομπή Chicago Style

Krishna Gopal. River Pollution in India and Its Manangement. New Delhi: APH, 2003.

Παραπομπή MLA

Krishna Gopal. River Pollution in India and Its Manangement. APH, 2003.