Hagy, Heath M., Scott C. Yaich, John W. Simpson, Eduardo Carrera, David A. Haukos, W. Carter Johnson, Charles R. Loesch, et al. 2014. “Wetland Issues Affecting Waterfowl Conservation in North America”. Wildfowl, November, 343–367. https://tidsskrift.dk/Wildfowl/article/view/153639.