Efendi E, Bil’ibad RA, Al Farisi MS. Konsep Sistem, Jenis-Jenis Sistem Dan Model Sistem. JPDK [Internet]. 2023Apr.10 [cited 2024May17];5(2):3816-20. Available from: http://journal.universitaspahlawan.ac.id/index.php/jpdk/article/view/13919