ศิริธร คมวิทย์. 2017. “Effects of the Trade Liberalization in the ASEAN Community on SMEs’ Production Costs Between Songkhla, Thailand and Kedah, Malaysia”. Parichart Journal 30 (3):221-30. https://so05.tci-thaijo.org/index.php/parichartjournal/article/view/101094.