Tawichai, Suphachai, Thinnawat Sroikudrua, and Piyaporn Punkasirikul. 2023. “Meaning extension of the Korean loan word oppa in the Thai context”. Kasetsart Journal of Social Sciences 44 (1):293–300. https://so04.tci-thaijo.org/index.php/kjss/article/view/264477.