American Catholic Historical Association (1 September 1909). the Catholic Encyclopedia. Vol. 56. The Encyclopedia Press. p. 778. Archived from the original on 11 January 2014. Retrieved 2011-03-06.
catholic.org
Catholic Encyclopedia editorial staff (1907–1912). "greenland". Catholic Encyclopedia. Archived from the original on 2011-07-25. Retrieved 2011-03-01.
American Catholic Historical Association (1 September 1909). the Catholic Encyclopedia. Vol. 56. The Encyclopedia Press. p. 778. Archived from the original on 11 January 2014. Retrieved 2011-03-06.