Jacobsen, L. B., Thorup, K., Dabelsteen, T.
, Sunde, P., Holsegård-Rasmussen, M., Ottesen, N., Svenne, S. & Rahbek, K. (2007).
Territorial calls in Little Owls: spatial dispersion and social interplay of mates and neighbours. Poster session presented at 4th World Owl Conference, Groningen, Netherlands.
Clausen, P., Kahlert, J., Hounisen, J. P., Olsen, K., Bøgebjerg, E. & Kjeldsen, J. P. (2007).
Tøndermarskens ynglefugle 2005-2006: Naturovervågning. Danmarks Miljøundersøgelser, Aarhus Universitet. Arbejdsrapport fra DMU No. 238
Http://www.dmu.dk/Udgivelser/Arbejdsrapporter/Nr.+200-249/Abstracts/AR238.htm
Fox, A. D., Walsh, A. J., Norriss, D. W., Wilson, H. J., Stroud, D. A., Francis, I. S., Boere, G. C. (Ed.), Galbraith, C. A. (Ed.) & Stroud, D. A. (Ed.) (2007).
Twenty-five years of population monitoring - the rise and fall of the Greenland White-fronted Goose Anser albifrons flavirostris. In G. C. Boere, C. A. Galbraith & D. A. Stroud (Eds.),
Waterbirds around the world: A global overview of the conservation, management and research of the world's waterbird flyways (pp. 637-639). Edinburgh Stationery Office.
http://www.jncc.gov.uk/PDF/pub07_waterbirds_part5.1.10.pdf