Szlachta, Bogdan. “ROMAN CHURCH AS THE FIRST ‘SOVEREIGN POLITICAL BEING’? INVESTIGATIONS FOR THE (PROBLEMATIC) SOURCES OF SOVEREIGNTY CONCEPT CONTINUED”. HORIZONS OF POLITICS 7, no. 18 (November 18, 2016): 11-31. Accessed April 27, 2025. https://horyzontypolityki.ignatianum.edu.pl/HP/article/view/729.