6L, Venkatachalarn. The contingent valuation method: a review.Environmental Impact Assessment Review.2004(24):89-124.
7Choong-Ki Leea, Sang-Yoel Hanb. Estimating the use and preservation values of national parks tourism resources using a contingent valuation method. Tourism Management 2002(23):531-540.
8Daniel Francoa, Davide Francob, llda Manninoa, Gabriela Zanettoa. The role of agroforestry networks in landscape socioeconomic processes: the potential and limits of the contingent valuation method. Landscape and Urban Planning 2001(56):239-256.
9Noboru Nomuraa, Makoto Akai. Willingness to pay for green electricity in Japan as estimated through contingent valuation method. Applied Energy 2004(78) :453-463.
10Liisa Tyrvaeinen,Harmu Vaeaenaenen .The economic value of urbanforest amenities: an application of the contingent valuation method.Landscape and Urban Planning 1998(43):105-118.
