Nugraha AL. Penerapan Etika Bisnis Islam di Koppontren La Tansa Pondok Modern Darussalam Gontor, Tahun 2015. JES [Internet]. 2016 Oct. 22 [cited 2024 Nov. 22];1(2). Available from: https://ejournal.umm.ac.id/index.php/JES/article/view/3678