René Chartrand; Keith Durham; Mark Harrison; Ian Heath (22. 9. 2016). The Vikings. Bloomsbury Publishing. стр. 7. ISBN978-1-4728-1323-7.CS1 одржавање: Формат датума (веза)
Ole Crumlin-Pedersen (31. 12. 2013). „Vikling Warriors and the Byzantine Empire”. Ур.: Line Bjerg; John H. Lind; Soren Michael Sindbaek. From Goths to Varangians: Communication and Cultural Exchange between the Baltic and the Black Sea. Aarhus University Press. стр. 297—. ISBN978-87-7124-425-0.CS1 одржавање: Формат датума (веза)
Alexander Basilevsky (5. 4. 2016). Early Ukraine: A Military and Social History to the Mid-19th Century. McFarland. стр. 85. ISBN978-1-4766-2022-0. „The main activity was the production of amber and glass beads for the fur trade where the pelts were bought from local hunters and sold to the Bulgars and Khazars for valuable silver dirhams. In fact, the Staraia Ladoga settlements were built initially as a manufacturing center and to conduct trade in the north and in the Baltic region. This is confirmed by silver dirham finds in some of the earliest log buildings constructed there […]”CS1 одржавање: Формат датума (веза)