1. Biddle, S. J., Sallis, J. F. & Cavill, N. (1998). Young and active? Young people and health-enhancing physical activity-evidence and implications. Health Education Authority.;
2. Božović, Z. (2011). Efekti primene dopunskih vežbi i kružnog treninga na aktivno vreme vežbanja na času fizičkog vaspitanja i motoričke sposobnosti učenika srednje škole (magistarski rad). Beograd: Fakultet sporta i fizičkog vaspitanja.;
3. Brusseau, T., Kulinna, P., Tudor-Locke, C., Van der Mars, H. & Darst, P. (2011). Children‘s step counts on weekend, physical education and non-physical education days. Journal of Human Kinetics. 27, 123-134.;
4. Cardon, G. & De Bourdeaudhuij, I. (2004). A pilot study comparing pedometer counts with reported physical activity in elementary schoolchildren. Pediatric Exercise Science. 16 (4), 355-367.;
5. Clark, J. E., Clements, R. L., Guddemi, M., Morgan, D. W., Pica, R., Pivarnik, J. M., & Virgilio, S. J. (2002). Active Start: A Statement of Physical Activity Guidelines for Children Birth to Five Years. AAHPERD Publications, PO Box 385, Oxon Hill, MD 20750-0385 Stock no. 304-10254.;