Παραπομπή APA

Gupta, A. Billion is enough: India's population problem a way out. 2001.

Παραπομπή Chicago Style

Gupta, Ashok. Billion Is Enough: India's Population Problem a Way Out. New Delhi: 2001.

Παραπομπή MLA

Gupta, Ashok. Billion Is Enough: India's Population Problem a Way Out. 2001.