Chantimaporn Khiadsang และ Martin Goerlich. (2016) Factors influencing the tourists’ length of stay in Koh Pha Ngan, Surat Thani province, Thailand. Stamford International University:ม.ป.ท.Chantimaporn Khiadsang และ Martin Goerlich. 2016. Factors influencing the tourists’ length of stay in Koh Pha Ngan, Surat Thani province, Thailand. ม.ป.ท.:Stamford International University;Chantimaporn Khiadsang และ Martin Goerlich. Factors influencing the tourists’ length of stay in Koh Pha Ngan, Surat Thani province, Thailand. ม.ป.ท.:Stamford International University, 2016. Print.