Pruekpramool, C. ., N. . Jaroentaku, and S. . Srisuttiyakorn. “Efficiency of Pearson, Spearman and Kendall’s Correlation Coefficients When Data Is Non-Normal Distributed”. An Online Journal of Education, vol. 15, no. 2, Dec. 2020, p. OJED1502040 (16 pages), https://so01.tci-thaijo.org/index.php/OJED/article/view/245395.