Sumalee Wongcharoenkul และ Sid Suntrayuth. (2023) Tourism service management and foreign seniorTravelers' behavior in Thailand. National Institute of Development Administration:ม.ป.ท.Sumalee Wongcharoenkul และ Sid Suntrayuth. 2023. Tourism service management and foreign seniorTravelers' behavior in Thailand. ม.ป.ท.:National Institute of Development Administration;Sumalee Wongcharoenkul และ Sid Suntrayuth. Tourism service management and foreign seniorTravelers' behavior in Thailand. ม.ป.ท.:National Institute of Development Administration, 2023. Print.