Raj, D., P. Kumar Swain, B. Behera, and B. Pratap Singh. “Quantile Regression Approach for Quality of Life of Construction Labourers in Varanasi City, India”. Thailand Statistician, vol. 19, no. 1, Dec. 2020, pp. 58-68, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/242811.