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2. Burnell, D., Perkins, A. J., Newton, S. F., Bolton, M., Tierney, T. D. & Dunn, T. E. 2023. Seabirds Count: A census of breeding seabirds in Britain and Ireland (2015-2021). Lynx Edicions, Barcelona.
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4. Duncan, N., Taylor, K., Wanless, S. & Wood, V. 1982. The birds of Boreray, St Kilda. Seabird Report 1977-1981: 18-24. Seabird Group.
5. Hatsell, C. 2018. Seabird and Marine Ranger Annual Report St Kilda 2018. National Trust for Scotland Report.