S. Tzvetkov, Plamen. “State and Church Relations under Communism, National Socialism and Fascism: Some Aspects of the Problem”. Forum Theologicum Sardicense, no. 2 (May 23, 2025): 7–20. Accessed August 10, 2025. https://periodicals.uni-sofia.bg/index.php/forum-theologicum-sardicense/article/view/581.