Bello, M. N., and M. A. Musa. “Prediction of Natural Gas Compressibility Factor in a Single-Phase Gas Reservoir: A Comparative Study”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 16, no. 1, Mar. 2020, pp. 164-78, https://www.azojete.com.ng/index.php/azojete/article/view/194.