1. Adam of Bremen (1075) History of the archbishops of Hamburg-Bremen (Gesta Hammaburgensis ecclesiae pontificum). English version by Tschan FJ, Reuter T, 2002. Columbia University Press, New York, 257 pp
2. Anderson RB (1891) America not discovered by Columbus. An historical sketch of the discovery of America by the Norsemen in the tenth century. Griggs & Company, Chicago
3. Anonymous (2014) The Viking “Maine Penny” mystery. Thornews, 21 February 2014.
https://thornews.com/2014/02/21/the-viking-maine-penny-mystery/
. Accessed 20 April 2016
4. Ansorge J (2009) Die Ausgrabungen für das Stralsunder OZEANEUM: Einblicke in den Hafen einer Hansestadt. Meer und Museum 22:11–36
5. Ansorge J, Frenzel P, Thomas M (2011) Cogs, sand and beer—a palaeontological analysis of medieval ballast sand in the harbour of Wismar (Southwestern Baltic Sea Coast, Germany). In: Bork H.-R., Meller H, Gerlach R (eds) Umweltarchäologie—Naturkatastrophen und Umweltwandel im archäologischen Befund. Tagungen des Landesmuseums für Vorgeschichte Halle (Saale) 6: 161–173