Rattiya Suddeephong Lippe และ Somporn Isvilanonda. (2010) Determinants of consumer preferences towards and willingness to pay for safety fresh fruits and vegetables in Bangkok and Chiang Mai urban areas. Kasetsart University,:ม.ป.ท.Rattiya Suddeephong Lippe และ Somporn Isvilanonda. 2010. Determinants of consumer preferences towards and willingness to pay for safety fresh fruits and vegetables in Bangkok and Chiang Mai urban areas. ม.ป.ท.:Kasetsart University,;Rattiya Suddeephong Lippe และ Somporn Isvilanonda. Determinants of consumer preferences towards and willingness to pay for safety fresh fruits and vegetables in Bangkok and Chiang Mai urban areas. ม.ป.ท.:Kasetsart University, 2010. Print.