References
- Omand, Donald (ed.) (2003) The Orkney Book. Edinburgh. Birlinn. ISBN 1-84158-254-9
- Haswell-Smith, Hamish (2004). The Scottish Islands. Edinburgh: Canongate. ISBN 978-1-84195-454-7.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.
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