Pruekpramool, C. ., Jaroentaku , N. ., & Srisuttiyakorn , S. . (2020). Efficiency of Pearson, Spearman and Kendall’s Correlation Coefficients When Data is Non-normal Distributed. An Online Journal of Education, 15(2), OJED1502040 (16 pages). Retrieved from https://so01.tci-thaijo.org/index.php/OJED/article/view/245395