Mulyani, S. R., V. N. Sari, and M. W. Sari. “Model of Employee Motivation and Cooperative Performance”. Utopía Y Praxis Latinoamericana, Vol. 25, no. 1, May 2020, pp. 232-4, https://mail.produccioncientificaluz.org/index.php/utopia/article/view/31895.