Preidel, Helmut. „Boba, Imre: Nomads, Northmen and Slavs. Eastern Europe in the Ninth Century“. Südost-Forschungen 1, no. 1 (November 30, 2021): 392–393. Zugegriffen April 29, 2024. https://www.suedost-forschungen.de/portal/index.php/sof/article/view/11818.