Geist, V. (1971). Mountain sheep: A study in behavior and evolution. University of Chicago Press.
Chicago-viite (17. p.)Geist, Valerius. Mountain Sheep: A Study in Behavior and Evolution. Chicago: University of Chicago Press, 1971.
MLA-viite (9. p.)Geist, Valerius. Mountain Sheep: A Study in Behavior and Evolution. University of Chicago Press, 1971.
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