Sihombing, S. O., and Y. F. C. Palupi Meilani. “Sustainability of Micro Entrepreneurs and Empowerment Perception:: An Empirical Study in Indonesia”. International Journal of Advanced Science and Technology, Vol. 28, no. 8s, Oct. 2019, pp. 405 -12, http://sersc.org/journals/index.php/IJAST/article/view/901.