Davis, Susan E, Erwin E Klaas, and Kenneth J Koehler. “Diurnal Time-Activity Budgets and Habitat Use of Lesser Snow Geese Anser Caerulescens in the Middle Missouri River Valley During Winter and Spring”. Wildfowl (January 1, 1989): 45–54. Accessed December 17, 2025. https://tidsskrift.dk/Wildfowl/article/view/154026.