Birka Axe References
- “Statens historiska museum,” Text.Homepage.Organizational, accessed May 22, 2017, http://mis.historiska.se/mis/sok/fid.asp?fid=417955&page=1&in=1.
- “Hurstwic: Iron Production in the Viking Age,” accessed April 25, 2017, http://www.hurstwic.org/history/articles/manufacturing/text/bog_iron.htm.
- Ibid.
- “Birka | Medieval City, Sweden,” Encyclopedia Britannica, accessed May 22, 2017, https://www.britannica.com/place/Birka.
- “Petersen Type M | Projekt Forlǫg,” accessed May 22, 2017, http://sagy.vikingove.cz/tag/petersen-type-m/.
- Ibid.