Bassey, N. O., Moffat, V. E. and James, I. I. (2025) “Proportion Defective Chart to monitor ARSAN Sachet Water Production Process”, International Journal of Natural and Practical Sciences (IJNPS), 7(2), pp. 44–50. Available at: https://icidr.org.ng/index.php/Ijnps/article/view/1774 (Accessed: 16 December 2025).