Kukkong, Prajak. “The Development of an E-learning Lessons Principles of Advertising and Public Relations for Undergraduate Student”. Journal of Humanities and Social Sciences, Rajapruk University 8, no. 1 (April 25, 2022): 112–124. accessed August 28, 2026. https://so03.tci-thaijo.org/index.php/rpu/article/view/260267.