Grønlands Forhistorie, editor Hans Christian Gulløv, Gyldendal, Copehagen, 2005. ISBN 87-02-01724-5.
"Skraeling: First Peoples of Helluland, Markland, and Vinland.” Odess, Daniel; Stephen Loring; and William W. Fitzhugh. From Vikings: The North Atlantic Saga. Fitzhugh, William W. and Elisabeth I. Ward, editors. Copyright 2000 Smithsonian Institution. Pages 193-205. ISBN 15-60-98995-5.