Restendy, Mochammad. “Dakwah Virtual Yayasan Spirit Dakwah Indonesia (SPIDI) Tulungagung”. Proceedings of Annual Conference for Muslim Scholars, no. Series 1 (April 22, 2018): 298-305. Accessed December 6, 2022. http://proceedings.kopertais4.or.id/index.php/ancoms/article/view/132.