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Geukes, Katharina; Morf, Carolyn C.; Back, Mitja D. (2020). Narcissism. In: Hackfort, Dieter; Schinke, Robert J. (eds.) The Routledge International Encyclopedia of Sport and Exercise Psychology. Volume 1: Theoretical and Methodological Concepts (pp. 375-390). London: Routledge
Hossner, Ernst-Joachim; Kredel, Ralf; Franklin, David W. (2020). Practice. In: Hackfort, Dieter; Schinke, Robert J. (eds.) The Routledge International Encyclopedia of Sport and Exercise Psychology: Volume 2: Applied and Practical Measures. International Perspectives on Key Issues in Sport and Exercise Psychology: Vol. 2 (pp. 532-554). Milton: Routledge
