Raudsepp, Lennart; Päll, Peep (November 2006). "The Relationship between Fundamental Motor Skills and Outside-School Physical Activity of Elementary School Children". Pediatric Exercise Science. 18 (4): 426–35. doi:10.1123/pes.18.4.426. PMID39152604.
Utesch, T.; Dreiskämper, D.; Strauss, B.; Naul, R. (1 January 2018). "The development of the physical fitness construct across childhood". Scandinavian Journal of Medicine & Science in Sports. 28 (1): 212–19. doi:10.1111/sms.12889. ISSN1600-0838. PMID28376240. S2CID5276116.
Raudsepp, Lennart; Päll, Peep (November 2006). "The Relationship between Fundamental Motor Skills and Outside-School Physical Activity of Elementary School Children". Pediatric Exercise Science. 18 (4): 426–35. doi:10.1123/pes.18.4.426. PMID39152604.
Utesch, T.; Dreiskämper, D.; Strauss, B.; Naul, R. (1 January 2018). "The development of the physical fitness construct across childhood". Scandinavian Journal of Medicine & Science in Sports. 28 (1): 212–19. doi:10.1111/sms.12889. ISSN1600-0838. PMID28376240. S2CID5276116.
Utesch, T.; Dreiskämper, D.; Strauss, B.; Naul, R. (1 January 2018). "The development of the physical fitness construct across childhood". Scandinavian Journal of Medicine & Science in Sports. 28 (1): 212–19. doi:10.1111/sms.12889. ISSN1600-0838. PMID28376240. S2CID5276116.
Heitler, W.J. (January 2007). "How Grasshoppers Jump". University of St Andrews. Archived from the original on 24 September 2015. Retrieved 3 April 2015.
Heitler, W.J. (January 2007). "Performance". University of St Andrews. Archived from the original on 19 March 2015. Retrieved 13 April 2015.
Heitler, W.J. (January 2007). "Energy and Power". University of St Andrews. Archived from the original on 18 November 2014. Retrieved 5 May 2015.
Heitler, W.J. (January 2007). "How Grasshoppers Jump". University of St Andrews. Archived from the original on 24 September 2015. Retrieved 3 April 2015.
Heitler, W.J. (January 2007). "Performance". University of St Andrews. Archived from the original on 19 March 2015. Retrieved 13 April 2015.
Heitler, W.J. (January 2007). "Energy and Power". University of St Andrews. Archived from the original on 18 November 2014. Retrieved 5 May 2015.
Utesch, T.; Dreiskämper, D.; Strauss, B.; Naul, R. (1 January 2018). "The development of the physical fitness construct across childhood". Scandinavian Journal of Medicine & Science in Sports. 28 (1): 212–19. doi:10.1111/sms.12889. ISSN1600-0838. PMID28376240. S2CID5276116.