Seznam. South Ronaldsay [online]. mapy.cz [cit. 2021-05-04]. Dostupné online.
Tomg of the Eagles (Isbister Chambered Cairn) [online]. mapy.cz [cit. 2021-05-04]. Dostupné online.
scotlandscensus.gov.uk
2011 Census: First Results on Population and Household Estimates for Scotland - Release 1C (Part Two) [online]. National records of Scotland, 2013 [cit. 2021-05-04]. Dostupné online. (anglicky)
stonepages.com
Isbister (Tomb of the Eagles) [online]. [cit. 2021-05-04]. Dostupné online. (anglicky)
tomboftheeagles.co.uk
Tomb of the Eagles [online]. [cit. 2021-05-04]. Dostupné online. (anglicky)
web.archive.org
Orkney Placenames. The island´s names [online]. [cit. 2021-05-04]. Dostupné v archivu pořízeném dne 2000-08-30. (anglicky)