Liechtenhan, Francine-Dominique. “The Tsar and the Papal Nuncio : An Awkward Interconfessional Meeting”. Quaestio Rossica 6, no. 3 (October 11, 2018): 658–674. Accessed September 17, 2021. https://qr.urfu.ru/ojs/index.php/qr/article/view/qr.319.