Du Yaping. (1998). The value of improved water quality for recreation in East Lake, Wuhan, China: Application of contingent valuation and travel cost methods. Economy and Environment Program for Southeast Asia.
Chicagoスタイル(17版)引用形式Du Yaping. The Value of Improved Water Quality for Recreation in East Lake, Wuhan, China: Application of Contingent Valuation and Travel Cost Methods. Singapore: Economy and Environment Program for Southeast Asia, 1998.
MLA(9版)引用形式Du Yaping. The Value of Improved Water Quality for Recreation in East Lake, Wuhan, China: Application of Contingent Valuation and Travel Cost Methods. Economy and Environment Program for Southeast Asia, 1998.
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