King, Carolyn M., and Roger A. Powell. "Adjustable Living Spaces." The Natural History of Weasels and Stoats: Ecology, Behavior, and Management. : Oxford University Press, 2007-03-29. Oxford Scholarship Online. 2010-04-01. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195322712.001.0001/acprof-9780195322712-chapter-8>.
King, C., & Powell, R.(2007-03-29). Adjustable Living Spaces. In The Natural History of Weasels and Stoats: Ecology, Behavior, and Management. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195322712.001.0001/acprof-9780195322712-chapter-8.
King, Carolyn M., and Roger A. Powell. "Adjustable Living Spaces." In The Natural History of Weasels and Stoats: Ecology, Behavior, and Management. : Oxford University Press, 2007-03-29. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195322712.001.0001/acprof-9780195322712-chapter-8.
King CM, Powell RA. Adjustable Living Spaces. In: King CM, Powell RA, Powell C. The Natural History of Weasels and Stoats: Ecology, Behavior, and Management. Oxford University Press; 2007. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195322712.001.0001/acprof-9780195322712-chapter-8. Accessed May 24, 2013.