Friis, A. (1944) “Aksel E. Christensen: Dutch trade to the Baltic about 1600. Studies in the Sound Toll Register and Dutch Shipping Records (Kbh. og Haag 1941, 480 Sider).”, Historisk Tidsskrift, 100. Tilgængelig hos: https://tidsskrift.dk/historisktidsskrift/article/view/50148 (Set: 25oktober2020).