Voralak Kiawmeesuan ว.เ., Santhipharp Khamsa-ard ส.ค. and ศิริวงศ์ พ. 2018. Guiedlines for Potential Development of Spa Business Focus on Expectation of Foreign Tourists in Huahin District, Prachuapkirikhan Province. Dusit Thani College Journal. 12, 2 (May 2018), 167–181.