“Andrew S. Finstuen tarafından yazılan Original Sin and Everyday Protestants: The Theology of Reinhold Niebuhr, Billy Graham, and Paul Tillich in an Age of Anxiety” (2009) Journal of American Studies of Turkey, ss. 161–162. Erişim adresi: https://jast.org.tr/index.php/main/article/view/2000 (Erişim: 6 Kasım 2026).