Saragih, Jan Christian Wismar. “Costly Grace According to Dietrich Bonhoeffer: Why Does It Still Matter Today?”. KAMASEAN: Jurnal Teologi Kristen 6, no. 1 (June 13, 2025): 19-31. Accessed January 16, 2026. https://kamasean.iakn-toraja.ac.id/index.php/ojsdatakamasean/article/view/380.