เติมสงวนวงศ์ ศ. “The Business Achievement Factors of Five Star OTOP Product Champion (OPC) Entrepreneur Within Chiang Mai Province: Case Study at Sansai District”. Journal of Management Science Chiangrai Rajabhat University, vol. 7, no. 1, June 2018, pp. 82-105, https://so03.tci-thaijo.org/index.php/jmscrru/article/view/127133.