Patricia Monaghan, "A Viking Visitation?" in Wineries of Wisconsin and Minnesota (Minnesota Historical Society, 2008), p. 82 online.
doi.org
Hughey, Michael W.; Michael G. Michlovic (1989). ""Making" history: The Vikings in the American Heartland". International Journal of Politics, Culture, and Society. 2 (3): 338–360. doi:10.1007/BF01384829. S2CID145559328.
semanticscholar.org
api.semanticscholar.org
Hughey, Michael W.; Michael G. Michlovic (1989). ""Making" history: The Vikings in the American Heartland". International Journal of Politics, Culture, and Society. 2 (3): 338–360. doi:10.1007/BF01384829. S2CID145559328.