Isa Shuaibu, Mohammed, Aliyu Rafindadi Sanusi, and Maryam Bala Adamu. “Substitutability of Currency in Nigeria: A Non-Linear Approach”. Gusau International Journal of Management and Social Sciences 4, no. 3 (October 1, 2021): 18. Accessed June 15, 2026. https://gijmss.com.ng/index.php/gijmss/article/view/83.