Kulman, Detlef. „Boršukov, Georgi: Istorija Na bŭlgarskata žurnalistika“. Südost-Forschungen 1, no. 1 (November 30, 2021): 528–530. Zugegriffen April 29, 2024. https://www.suedost-forschungen.de/portal/index.php/sof/article/view/11954.