Uakarn, chanuan, Kajohnsak Chaokromthong, and Nittaya Sintao. 2021. “Sample Size Estimation using Yamane and Cochran and Krejcie and Morgan and Green Formulas and Cohen Statistical Power Analysis by G*Power and Comparisions”. APHEIT International Journal of Interdisciplinary Social Sciences and Technology 10 (2):76-86. https://so04.tci-thaijo.org/index.php/ATI/article/view/254253.