Saragih RM, Nasution MIP, Nurbaiti N. The Effect of Operational Efficiency on Café Performance. J. Soc. Work Sci. Educ. [Internet]. 2025 Jun. 11 [cited 2026 Apr. 18];6(2):512-25. Available from: https://www.ejournal.sembilanpemuda.id/index.php/jswse/article/view/1074