Gupta, A. Billion is enough: India's population problem a way out. 2001.
シカゴスタイル引用形Gupta, Ashok. Billion Is Enough: India's Population Problem a Way Out. New Delhi: 2001.
MLA引用形式Gupta, Ashok. Billion Is Enough: India's Population Problem a Way Out. 2001.
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