Siraprapa Kongkaew และ Siriporn Lerdpaisalwong. (2025) Error Investigation of Public Signs and Foreigners’ Perceptions of Business Signs in Bangkok: A Case Study of Sathorn and Sukhumvit Areas. <i>Journal of Liberal Arts, Prince of Songkla University</i>, <i>17</i>(1), 281659, pp.1-19.Siraprapa Kongkaew และ Siriporn Lerdpaisalwong. "Error Investigation of Public Signs and Foreigners’ Perceptions of Business Signs in Bangkok: A Case Study of Sathorn and Sukhumvit Areas". Journal of Liberal Arts, Prince of Songkla University 17 (2025):281659, pp.1-19.Siraprapa Kongkaew และ Siriporn Lerdpaisalwong. Error Investigation of Public Signs and Foreigners’ Perceptions of Business Signs in Bangkok: A Case Study of Sathorn and Sukhumvit Areas. Faculty of Liberal Arts, Prince of Songkla University:ม.ป.ท. 2025.