Gopal, K. (2003). River pollution in india and its management.
シカゴスタイル引用形Gopal, Krishnan. River Pollution in India and Its Management. New Delhi, 2003.
MLA引用形式Gopal, Krishnan. River Pollution in India and Its Management. 2003.
警告: この引用は必ずしも正確ではありません.