Varinnar Siripooththilak และ Kanokkarn Kaewnuch. (2018) Guideline of the hot spring management to promote the quality of health tourism in Thailand. National Institute of Development Administration:ม.ป.ท.Varinnar Siripooththilak และ Kanokkarn Kaewnuch. 2018. Guideline of the hot spring management to promote the quality of health tourism in Thailand. ม.ป.ท.:National Institute of Development Administration;Varinnar Siripooththilak และ Kanokkarn Kaewnuch. Guideline of the hot spring management to promote the quality of health tourism in Thailand. ม.ป.ท.:National Institute of Development Administration, 2018. Print.