Allen, T., Goff, J. E. Julkaisussa Sports Engineering (2018) “...educational training...”
Frank, B., Donnelly, C. Julkaisussa Sports Engineering (2018) “...educational training...”
Budinger, E. Julkaisussa Leistungssport (1991) “...educational training...”
Kretschmar, J. Julkaisussa Theorie und Praxis des Leistungssports (1983) “...educational training...”