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.
Citazione stile Chigago Style (17a edizione)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.
Citatione MLA (9a 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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.