ivenr3, ivenr3 (2021) “TEACHING SUPPLEMENT TO INTRODUCTORY ECONOMICS COURSES VOCATIONAL CERTIFICATE LEVEL (VOCATIONAL CERTIFICATE) IN MARKETING VIA THE ONLINE SYSTEM GOOGLE CLASSROOM”, T-VET JOURNAL, 4(8), pp. 72–86. available at: https://so01.tci-thaijo.org/index.php/TVETJournal_IVEN3/article/view/245238 (accessed: 15 September 2026).