Perry, Tim. „Joseph Ratzinger: Evangelical Ecumenist or How to Argue With a Traditional Protestant Over the Immaculate Conception“. Breslauer Theologische Rundschau 31, no. 2 (Dezember 19, 2023): 281–296. Zugegriffen Juni 4, 2025. https://ojs.academicon.pl/wpt/article/view/5454.