Boye, Jörgen (2009). "Sveriges grövsta kanon bevarad"(PDF). Skärgårdsstiftelsen (The Archipelago Foundation). p. 19. Archived from the original(PDF) on 4 March 2016. Retrieved 31 October 2015.
web.archive.org
Boye, Jörgen (2009). "Sveriges grövsta kanon bevarad"(PDF). Skärgårdsstiftelsen (The Archipelago Foundation). p. 19. Archived from the original(PDF) on 4 March 2016. Retrieved 31 October 2015.