ŠEMKOV, G. Čavrŭkov, Georgi: Središta na bŭlgarskata knižovnost. IX—XVIII vek. Südost-Forschungen, [S. l.], v. 1, n. 1, p. 424–425, 2021. Disponível em: https://www.suedost-forschungen.de/portal/index.php/sof/article/view/8831. Acesso em: 14 mai. 2024.