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van der Gaag, R.J. Bolier, L. Haverman, M. &; Walburg, J. A. Mental Fitness. Verbeter je Mentale Conditie. Amsterdam: Boom.isbn 978 94 6105 153 0, 175 p., € 19,50 euro. KIND ADOLESC. 32, 239–240 (2011). https://doi.org/10.1007/s12453-011-0029-2
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DOI: https://doi.org/10.1007/s12453-011-0029-2