Matchima, Kajita, Jumlong Vongprasert, and Nipaporn Chutiman. 2018. “The Development of a Correction Method for Ensuring a Continuity Value of The Chi-square Test with a Small Expected Cell Frequency”. Asian Health, Science and Technology Reports 26 (1):98-105. https://ph03.tci-thaijo.org/index.php/ahstr/article/view/1769.