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Creswell, J. W. (2014). Research design. qualitative, quantitative, and mixed methods approaches. Los Angeles: Sage.
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Selby, A., & Smith-Osborne, A. (2012). A Systematic Review of Effectiveness of Complementary and Adjunct Therapies and Interventions Involving Equines (Vol. 32).
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(2013). R Foundation for Statistical Computing. Vienna, Austria: R Foundation for Statistical Computing.
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Jerison H. J. (1988). Intelligence and Evolutionary Biology (J. J. Jerison H. J., Ed.).
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Van Horik, J., Clayton, N., & Emery, N. Oxford Handbook of Comparative Evolutionary Psychology (J. Vonk, & T. Shackelford, Eds.). New York: Oxford University Press.
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Blatz, S., Krüger, K., & Zanger, M. (2018). Der Hufmechanismus – was wir wirklich wissen! Eine historische und fachliche Auseinandersetzung mit der Biomechanik des Hufes. Wald: Xenophon Verlag e.K.
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Reader, S. M., & Laland, K. N. (2009). Animal Innovation. Oxford: Oxford University Press.
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Adelman, M., & Knijnik, J. (2013). Gender and Equestrian Sport. Dordrecht: Springer.
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Primack, R. B. (2010). Essentials of conservation biology. Fifth: Edition.
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(1993). Wolves in Europe: status and perspectives. Ettal, Germany: Munich Wildlife Society.
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