Gagarin UH, Purba YT, Rumbiak Y. PENINGKATAN KUALITAS LAYANAN PELANGGAN UMKM MELALUI IMPLEMENTASI SERVICE QUALITY DAN SOP OPERASIONAL. VISI SAKTI [Internet]. 2025 Dec. 22 [cited 2026 Sep. 1];3(2):90-5. Available from: https://journal.bukitpengharapan.ac.id/index.php/VISISAKTI/article/view/1034