7Mitsch W 1, Gosselink J G. Wetlands. Van Nostrand Reinhold, New York, 1986.
8Barbier E B. Sustainable Use of Wetlands-Valuing Tropical Wetland Benefits: EconomicMethodologies and applications [J]. The Geographical Journal, 1993, 59 (11) : 22 -35.
9Richard T W, Yong-Suhk Wui. The economic value of wetland services: ameta - analysis. Ecologlcal Economics, 2001, 37 (2) : 257 - 270.
