Thanyarat Chaiyakarm และผู้แต่งคนอื่นๆ. (2020) Geographic Information System for Behavior Analysis of Elderly Tourist Thai and Foreigners in Udon Thani Province. <i>Thai Journal of Science and Technology</i>, <i>9</i>(5), 603-616.Thanyarat Chaiyakarm และผู้แต่งคนอื่นๆ. "Geographic Information System for Behavior Analysis of Elderly Tourist Thai and Foreigners in Udon Thani Province". Thai Journal of Science and Technology 9 (2020):603-616.Thanyarat Chaiyakarm และผู้แต่งคนอื่นๆ. Geographic Information System for Behavior Analysis of Elderly Tourist Thai and Foreigners in Udon Thani Province. Thammasat University:ม.ป.ท. 2020.