Niwitpong, Sa-aat, and Pianpool Kirdwichai. “Adjusted Bonett Confidence Interval for Standard Deviation of Non-normal Distributions”. Thailand Statistician 6, no. 1 (May 28, 2015): 1–16. accessed September 28, 2026. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34327.