Barrett, R. T. (2001). Monitoring the Atlantic Puffin Fratercula arctica, Common Guillemot Uria aalge and Black-legged Kittiwake Rissa tridactyla breeding populations on Hornøya, northeast Norway, 1980-2000. Fauna Norvegica, 21, 1-10. https://doi.org/10.5324/fn.v21i0.5992