Sources:
- The Hill of Skulls Bronze Age Round Barrow. Shap - http://www.stone-circles.org.uk/stone/hillofskulls.htm
- Shap Historic Sites/ Archeaological Sites of the Lake District T. Clare Moorland Pub. Co. Ltd 1981 - https://shaphistoricsites.wordpress.com/prehistory/burial-sites-round-and-bowl-barrows/skellaw-hill/