Zaied, Moayad B, Ahmed M El Naim, and Dafalla M Mekki. “Development of Logarithmic Equations for Statistical Sample Determination”. Journal of Empirical Studies 1, no. 1 (March 20, 2014): 23–29. Accessed May 19, 2024. https://archive.conscientiabeam.com/index.php/66/article/view/2466.