Nonthamand, Narin, Narissara Suaklay, Kanwara Pumila, Sumittra Intha, and Nattapong Promwong. 2021. “A Survey of Online Learning Problems in General Education Course of University of Phayao Students”. ECT Education and Communication Technology Journal 16 (20):61-73. https://so01.tci-thaijo.org/index.php/ectstou/article/view/245679.