Stafford, Joshua D., Adam K. Janke, Michael J. Anteau, Aaron T. Pearse, Anthony D. Fox, Johan Elmberg, Jacob N. Straub, Michael W. Eichholz, and Céline Arzel. 2014. “Spring Migration of Waterfowl in the Northern Hemisphere: A Conservation Perspective”. Wildfowl, November, 70–85. https://tidsskrift.dk/Wildfowl/article/view/153650.