Appendiks 1 to I. Olsen, L. Dinesen, S. Hammer og J. Sonne 2025: Breeding bird population development on Skúgvoy, Faroe Islands, 1961-2023. – Dansk Orn. Foren. Tidsskr. 119: 89-104.
Appendiks 1-4 for K. Olsen & Danish Rarities Committee 2025: The Danish List: A Checklist of the Birds of Denmark. – Dansk Orn. Foren. Tidsskr. 119: 105-112