Batubara, S., K. . Nasution, J. Nelli, S. . Nasution, S. . Sobhan, and K. Kholidah. “Marriage Preparation Courses in Indonesia: Comparative Study of Muslims and Christians”. Al-Risalah: Forum Kajian Hukum Dan Sosial Kemasyarakatan, vol. 22, no. 1, June 2022, pp. 139-54, doi:10.30631/alrisalah.v22i1.1231.