Amuka, Joseph I., Fredrick O. Asogwa, Collins C. Ugwu, and Kelvin C. Ugwu. “Testing the Fit of Cobb-Douglass Production Function Within Unrestricted Least Squares”. International Journal of Economics and Financial Issues 8, no. 3 (May 6, 2018): 142–147. Accessed April 26, 2024. https://www.econjournals.com/index.php/ijefi/article/view/5544.