Thechawattanapanicharoen, Thanakit, and Mongkol Ekkaphan. 2021. “The Influence of Reference Group on Consumers Decision to Purchase Big Bikes in Roi Et Province”. Journal of Roi Et Rajabhat University 15 (1), 63-74. https://so03.tci-thaijo.org/index.php/reru/article/view/241776.