Carol S. Francis: The Lost Western Settlement of Greenland, 1342. California State University, Sacramento 2011, S.31 (Online).
google.de
books.google.de
James Robert Enterline: Erikson, Eskimos & Columbus: Medieval European Knowledge of America. The Johns Hopkins University Press, Baltimore / London 2002, ISBN 0-8018-6660-X, S.127–129 (eingeschränkte Vorschau in der Google-Buchsuche).
