Pruekpramool, Chaninan, Nattika Jaroentaku, and Siwachoat Srisuttiyakorn. “Efficiency of Pearson, Spearman and Kendall’s Correlation Coefficients When Data Is Non-Normal Distributed”. An Online Journal of Education 15, no. 2 (December 29, 2020): OJED1502040 (16 pages). Accessed May 7, 2024. https://so01.tci-thaijo.org/index.php/OJED/article/view/245395.