Stone Tools of Britain and Ireland: an Experimental Approach. University of Exter. [2014-08-30]. (原始内容存档于2015-09-20). National Museums of Scotland. Carved
late medieval warm period in the Southern Ocean as a delayed response to external forcing?. Geophysical Research Letters. 17 March 2004, 31 (6): 1–5. Bibcode:2004GeoRL