Yusup, M., Z. Lubis, and N. Rachmat. “Pandangan Tokoh Agama Non Islam Terhadap Gagasan Gus Dur Tentang Pluralisme”. Jurnal Studi Al-Qur’an, Vol. 10, no. 1, Jan. 2017, pp. 70 -82, https://journal.unj.ac.id/unj/index.php/jsq/article/view/4419.