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Marsh, Herbert; Gerlach, Erin; Trautwein, Ulrich; Lüdtke, Oliver; Brettschneider, Wolf-Dietrich (2007). Longitudinal study of preadolescent sport self-concept and performance: Reciprocal effects and causal ordering. Child development, 78(6), pp. 1640-1656. Malden, Mass.: Blackwell 10.1111/j.1467-8624.2007.01094.x
