Padua, Roberto N., Mark S. Borres, and Efren O. Barabat. “On a Logistic Approximation to the Normal and Other Cumulative Distribution Functions”. Recoletos Multidisciplinary Research Journal 2, no. 1 (June 30, 2014). Accessed May 4, 2024. https://rmrj.usjr.edu.ph/rmrj/index.php/RMRJ/article/view/42.