Poonperm Vardhanabindu และ Kitikorn Charmondusit. (2012) Implementation of eco-efficiency for the development of eco-agro-tourism at farm Chokchai. Mahidol University:ม.ป.ท.Poonperm Vardhanabindu และ Kitikorn Charmondusit. 2012. Implementation of eco-efficiency for the development of eco-agro-tourism at farm Chokchai. ม.ป.ท.:Mahidol University;Poonperm Vardhanabindu และ Kitikorn Charmondusit. Implementation of eco-efficiency for the development of eco-agro-tourism at farm Chokchai. ม.ป.ท.:Mahidol University, 2012. Print.