Boonroungrut, Chinun, and Huang Fei. 2018. “The Theory of Planned Behavior and Transtheoretical Model of Change: A Systematic Review on Combining Two Behavioral Change Theories in Research”. Journal of Public Health and Development 16 (1). Bangkok, Thailand:75-87. https://he01.tci-thaijo.org/index.php/AIHD-MU/article/view/100950.