Niels Henriksen; A.K. Higgins; Feiko Kalsbeek; T. Christopher R. Pulvertaft (2000). "Greenland from Archaean to Quaternary"(PDF). Greenland Survey Bulletin. No. 185. Archived from the original(PDF) on 2008-12-07. Retrieved 2009-10-04.
Niels Henriksen; A.K. Higgins; Feiko Kalsbeek; T. Christopher R. Pulvertaft (2000). "Greenland from Archaean to Quaternary"(PDF). Greenland Survey Bulletin. No. 185. Archived from the original(PDF) on 2008-12-07. Retrieved 2009-10-04.