Viliam Cicaj; Vladimir Seges; Julius Bartl; Dusan Skvarna; Robert Letz; Maria Kohutova (January 2002). Slovak History. Bolchazy-Carducci Publishers. p. 23. ISBN978-0-86516-444-4.
Teich, Mikuláš; Dušan Kováč; Martin D. Brown (2011). Slovakia in History. Cambridge University Press. ISBN9781139494946. Retrieved 20 November 2011.
Pohl 2004, p. 448. Pohl, Walter (2004). "Reviewed Work: The Early Slavs: Culture and Society in Early Medieval Eastern Europe by P. M. Barford". Speculum. 79 (2): 448–450. doi:10.1017/s0038713400087996.
Poulik, Josef (1978). "The Origins of Christianity in Slavonic Countries North of the Middle Danube Basin". World Archaeology. 10 (2): 158–171. doi:10.1080/00438243.1978.9979728.
Novák 1994, p. 7. Novák, Jozef (1994). "Genealógia ako historická disciplína" [Genealogy as a discipline of history] (PDF). In Štulrajterová, Katarína (ed.). Najstaršie rody na Slovensku (in Slovak). Slovenská genealogicko-heraldická spoločnosť pri Matici slovenskej. ISBN978-80-967103-0-0.