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Chaisson, E., & McMillan, S. (2004). Astronomy: A beginner’s guide to the Universe. Upper Saddle River , NJ : Pearson/Prentice Hall.  Page 151.

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Åkesson, S., Alerstam, T., & Muheim, R. (2003). Compass Orientation and Possible Migration routes of Passerine Birds at High Arctic Latitudes. OIKOS: A Journal of Ecology, 103(2), 347.