Obi, B. C., E. Amadi, C. L. Okafor, and E. Unuabonah. “The Impact of Tax Shield on Capital Structure: Empirical Evidence from Nigeria”. Nigerian Academy of Management Journal, vol. 15, no. 1, Mar. 2020, pp. 115-26, https://namj.tamn-ng.org/index.php/home/article/view/47.