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