1. Ackah, D. (2014a). Global Journal of Management Studies and Researches the Impact of Motivation on Employee Performance in the Manufacturing Industry in Ghana. Global Journal of Management Studies and Researches, 1(5), 291–310. www.academicjournalscenter.org
2. Ackah, D. (2014b). The Impact of Motivation on Employee Performance in the Manufacturing Industry in Ghana. Global Journal of Management Studies and Researches, 1(5).
3. Alwisol. (2009). Psikologi Kepribadian. Edisi Revisi. UMM Press.
4. Arifin, Z., Marzuki Husein, N., Jihadi, M., Prima Rini, H., Prasada, D., & Wijoyo, H. (2021). The Role of Employees Engagement and Self-Efficacy On Employee Performance: An Empirical Study On Palm Oil Company. In Volatiles & Essent. Oils (Vol. 8, Issue 4).
5. Ayundasari, D. Y., Sudiro, A., & Irawanto, D. W. (2017). Improving Employee Performance Through Work Motivation and Self-Efficacy Mediated by Job Satisfaction. Journal of Applied Management, 15(4). https://doi.org/10.21776/ub.jam.2017.015