1. The Trials of Pope Formosus Monroe, William S. 2021 Theses Middle AgesHistoryTrialsPopesCouncils and synods (Canon law)Formosus, Pope, approximately 816-896Stephen V, Pope, -891
2. Crosses, Hammers, And Sickles: Sino-vatican Relations Between 1949 And 1989 Zhang, Boyao 2015 Articles Relations with popesPopesPolitical scienceInternational relations