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Brandl-Bredenbeck, Hans Peter; Stefani, Miriam; Kessler, Catie; Brettschneider, Wolf-Dietrich; Kussin, Uli; Bortoli, Laura; Carraro, Attilio; Laskiene, Skaiste; Seghers, Jan; Vanreusel, Bartholomeus; Shpakov, Andrew; Sudeck, Gorden; Szczepanowska, Ewa; Umiastowska, Danuta (2009). Children today. Couch potatoes, fast food junkies, media freaks? Lifestyles and health behaviour. First results of an international comparison. International journal of physical education, 46(1), pp. 31-39. Aachen: Meyer & Meyer Sport 10.1021/j150415a004
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
