สมใจป., ปานจันทร์ว., พันธุ์ไทยบ. and สกลเกียรติว. (2019) “The Development of the Competencies of Sales Representatives of the Pasteurized Milk Industry through an Electronic Media Training Program”, Ph.D. in Social Sciences Journal, 9(1), pp. 88-102. Available at: https://so05.tci-thaijo.org/index.php/phdssj/article/view/108413 (Accessed: 5April2020).