ภุชฌงค์ วิศาล. “Loyalty of Amway Product of Customers in Pathumthani Province”. Mahamakut Graduate School Journal 15, no. 1 (March 12, 2019): 36–46. Accessed May 5, 2024. https://so04.tci-thaijo.org/index.php/mgsj/article/view/177309.