Siswati, Endang, and Diana Rapitasari. 2020. “OPTIMIZATION OF THE MANAGEMENT OF MICRO, SMALL AND MEDIUM ENTERPRISES IN SURABAYA TO INCREASE SALES VOLUME BASED ON MANAGER SKILLS”. International Conference of Business and Social Sciences 1 (1). https://debian.stiesia.ac.id/index.php/icobuss1st/article/view/36.