1. Abdu, M., & Jibir, A. (2018). Determinants of firms innovation in Nigeria. Kasetsart Journal of Social Sciences, 39(3), 448–456.
2. Ackerberg, D., Caves, K., & Frazer, G. (2006). Structural identification of production functions.
3. Adekunle, S. A., & Aghedo, E. M. (2015). Human capital development and productivity growth in Nigeria. Management Science Review, 6(2), 286–308.
4. Arshad, M. N. M., & Ab Malik, J. (2015). Quality of human and labour productivity: A case of Malaysia. International Journal of Economics, Management and Accounting, 23(1), 33–55.
5. Baharin, R., Syah Aji, R. H., Yussof, I., & Mohd Saukani, N. (2020). Impact of human resource investment on labor productivity in Indonesia. Iranian Journal of Management Studies, 13(1), 139–164.