Literature
- Gremillet D. and Argentin G. 1998. Cormorans et pêcheries autour des Îles Chausey [Cormorants, Shags and fisheries in the Chausey Islands area]. Le Cormoran 10: 196-202.
- Pearson T.H. 1968. The feeding biology of sea-bird species breeding on the Farne Islands, Northumberland. J. Anim. Ecol. 37:521-552.
- Steven G.A. 1933. The food consumed by Shags and Cormorants around the shores of Cornwall (England). J. Mar. Biol. Ass. U.K. 19: 277-292.