Thummakul, D., and P. Gawglaun. “CRYSTAL-BASED LEARNING AND SELF-REGULATION: PROCESS AND EXPECTED RESULTS”. JOURNAL OF THE POLICE NURSES AND HEALTH SCIENCE, vol. 12, no. 2, Dec. 2020, pp. 479-87, https://he01.tci-thaijo.org/index.php/policenurse/article/view/240932.