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.
Citace podle Chicago (17th ed.)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.
Citace podle MLA (9th ed.)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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