Habibullah, I., and R. Arafah. “Tarîqah Al-Tikrar Fî Hifzhi Al-Qur’an (Dirâsah Al-Hâlât Bi Ma’had Al-Muqaddasah, Ponorogo)”. Studia Quranika: Jurnal Studi Quran, vol. 4, no. 2, Jan. 2020, pp. 265-86, doi:10.21111/studiquran.v4i2.3817.