Dahlbergh, Erik Jönsson, greve,  Swidde, Willem,  Pufendorf, Samuel, Freiherr von,  Riegel, Christoph,  and Bergenhielm, Johan.  "Expeditio gloriosa potentismi: regis Suecorum Caroli Gustavi qua Mare Balticum glacie constrictum transiens cum exercitu omnique bellico apparatu e Langelandia in Laalandiam et cæteras insulas Danicas penetravit die 7 Februarij anno 1658."  Print.  1696.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:ht250254s (accessed April 02, 2020).