Pratama, Herdifa. “Validitas Akad Dalam Perjanjian Lisensi Hak Cipta Di Indonesia”. Ulumuddin : Jurnal Ilmu-ilmu Keislaman 12, no. 1 (February 7, 2022): 63-78. Accessed August 16, 2022. https://jurnal.ucy.ac.id/index.php/agama_islam/article/view/1053.