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Creswell, J. W. (2014). Research design. qualitative, quantitative, and mixed methods approaches. Los Angeles: Sage.
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Hampson, B. A., Zabek, M. A., Pollitt, C. C., & Nock, B. (2011). Health and behaviour consequences of feral horse relocation. Rangel. J., 33(2), 173–180.
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Bailey, D. (2016). Dominance Hierarchies in Horses: Comparing and Contrasting Different Methods for Assessing Hierarchies. Ursidae: The Undergraduate Research Journal at the University of Northern Colorado, 5(3).
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Leiner, L. (2006). Vergleich verschiedener Methoden zur Angstextinktion bei Pferden. Diploma thesis, , .
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Pérez-Barbería, F. J., Shultz, S., & Dunbar, R. I. (2007). Evidence for coevolution of sociality and relative brain size in three orders of mammals. Evolution, 61.
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Van Schaik, C. P., & Burkart, J. M. (2011). Social learning and evolution: the cultural intelligence hypothesis. Philos Trans R Soc B, 366.
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Heyes, C. (2012). What's social about social learning? J Comp Psychol, 120.
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Van Horik, J., & Emery, N. (2011). Evolution of cognition. Wiley Interdiscip Rev Cogn Sci, 2.
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Shettleworth, S. J. (2009). The evolution of comparative cognition: is the snark still a Boojum? Behav Processes, 80.
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Kruska, D. (1988). Mammalian domestication and its effect on brain structure and behavior. In H. J. Jerison, & I. Jerison (Eds.), Intelligence and Evolutionary Biology. New York: Springer-Verlag.
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