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De Villiers, N., Venter, R. E. Julkaisussa African Journal for Physical, Health Education, Recreation and Dance (2015)
Kruger, P. E., Smit, R. Julkaisussa African Journal for Physical, Health Education, Recreation and Dance (2012)
Hene, N. M., Bassett, S. H., Andrews, B. S. Julkaisussa African Journal for Physical, Health Education, Recreation and Dance (2011)
Venter, R. E., Opperman, E., Opperman, S. Julkaisussa African Journal for Physical, Health Education, Recreation and Dance (2011)