GRÄF, Rudolf. “PROFILE: Harald Heppner - A Historian of Southeastern Europe”. Studia Universitatis Babeș-Bolyai Historia 62, no. 1 (June 30, 2017): 83–86. Accessed February 5, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbhistoria/article/view/1887.