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Wasilewski, A. (2003). “Freundschaft” bei Huftieren? – Soziopositive Beziehungen zwischen nicht-verwandten artgleichen Herdenmitgliedern. Doctoral thesis, , . Retrieved May 22, 2018, from http://archiv.ub.uni-marburg.de/diss/z2003/0639/
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R. A. Hopkins. CALIFORNIA WILDLIFE HABITAT RELATIONSHIPS SYSTEM (Vol. M174). Retrieved May 22, 2018, from http://www.dfg.ca.gov/bdb/cwhr/lha/lha_M174.pdf
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Wakeling, E. (2002). Feral Horses of the West. Retrieved May 22, 2018, from http://web.archive.org/web/20050206074127/http://www.personal.psu.edu/users/e/n/enw107/
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Alverdes, F. (1925). Tiersoziologie. Leipzig: C. L. Hirschfeld,.
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Antonius, O. Zur Frage der Zähmung des Onager bei den alten Sumerern. l., , 477–484.
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Antonius O,. (1933). Bemerkungen über Bastarde und Bastardzucht. Biologica Generalis, 9, 39–47.
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Cheney D.L., & Seyfarth, R. M. (1990). How monkeys see the world: Inside the mind of another species. Chicago: University of Chicago Press.
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In Zentall T.R, G. B. G. (Ed.). Social Learning: Psychological and Biological Perspectives. Lawrence Erlbaum Associates.
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McDonnell, S. M. (Ed.). (2003). The Equid Ethogram: A Practical Field Guide to Horse Behavior. Lexington, Kentucky: Eclipse Press.
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Ginsberg, J. R. (1988). Social organisation and mating strategies of an arid adapted equid: The Grevy`s zebra. Ph.D. thesis, Princeton University, Princeton.
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