Inthakhan, Yadarat, Pusanisa Thechatakerng, Preeda Srinaruewan, and Sirikul Tulasombat. 2022. “Creating Competitive Advantage of Small Private Tutorial Business in Lampang Province”. University of the Thai Chamber of Commerce Journal Humanities and Social Sciences 42 (2). https://so06.tci-thaijo.org/index.php/utccjournalhs/article/view/250322.