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Åkesson, S., & Hedenström, A. (2004-06-17). Migration. In Bird Ecology and Conservation: A Handbook of Techniques. : Oxford University Press. Retrieved 20 Jan. 2021, from https://oxford.universitypressscholarship.com/view/10.1093/acprof:oso/9780198520863.001.0001/acprof-9780198520863-chapter-7.
Åkesson, Susanne, and Anders Hedenström. "Migration." Bird Ecology and Conservation: A Handbook of Techniques. : Oxford University Press,
September 01, 2007. Oxford Scholarship Online. Date Accessed 20 Jan. 2021 <https://oxford.universitypressscholarship.com/view/10.1093/acprof:oso/9780198520863.001.0001/acprof-9780198520863-chapter-7>.
Åkesson, Susanne, and Anders Hedenström. "Migration." In Bird Ecology and Conservation: A Handbook of Techniques, by Sutherland, William J., Ian Newton, and Rhys Green.. Oxford: Oxford University Press, 2004. Oxford Scholarship Online, 2007. doi: 10.1093/acprof:oso/9780198520863.003.0007.
Åkesson S, Hedenström A. Migration. In: Bird Ecology and Conservation: A Handbook of Techniques. Oxford University Press; 2004. https://oxford.universitypressscholarship.com/view/10.1093/acprof:oso/9780198520863.001.0001/acprof-9780198520863-chapter-7. Accessed January 20, 2021.