Amuka, Joseph I., Fredrick O. Asogwa, Collins C. Ugwu, and Kelvin C. Ugwu. 2018. “Testing the Fit of Cobb-Douglass Production Function Within Unrestricted Least Squares”. International Journal of Economics and Financial Issues 8 (3):142-47. https://econjournals.com/index.php/ijefi/article/view/5544.