Sulastri T. IMPLEMENTATION OF INTERNAL QUALITY ASSURANCE SYSTEMS IN IMPROVING THE QUALITY OF EDUCATION SERVICES: Research at the SPMI Model School SD Darul Hikam 2 Bandung Regency and SDN 200 Leuwipanjang Bandung City. al-Hasanah [Internet]. 2020 Dec. 26 [cited 2026 Feb. 27];5(2):53-60. Available from: https://jurnal.staip.ac.id/index.php/hasanah/article/view/11