Hoppe, Hans-Joachim. „Oren, Nissan: Bulgarian Communism. The Road to Power, 1934-1944; Oren, Nissan: Revolution Administered. Agrarianism and Communism in Bulgaria“. Südost-Forschungen 1, no. 1 (November 30, 2021): 417–418. Zugegriffen Mai 1, 2025. https://www.suedost-forschungen.de/portal/index.php/sof/article/view/10662.