[1. Bompa T.O. (2001) Teoria şi metodologia antrenamentului sportiv. C.N.F.P.A. Bucureşti;]Search in Google Scholar
[2. Hoff J. (2005) Training and testing physical capacities for elite soccer players. Journal of Sports Sciences, 23(6): 573 - 582;10.1080/02640410400021252]Search in Google Scholar
[3. Achten J„ Jeukendrup A.E. (2003) Heart rate monitoring: Applications and limitations. Sports Medicine, 33, 517 - 538;10.2165/00007256-200333070-00004]Search in Google Scholar
[4. Wisloff U., Helgerud J„ Hoff J. (1998) Strength and endurance of elite soccer players. Medicine and Science in Sports and Exercise, 30, 462 - 467.10.1097/00005768-199803000-00019]Search in Google Scholar
[5. Bagsbo J. (2003) Fitness training in soccer - a scientific approach. Reedswain Publishing, Michigan, pg. 71.]Search in Google Scholar
[6. <http://ilrigorista.blogspot.ro>]Search in Google Scholar
[7. <http://www.realitatea.net/tag/cristianoronaldo>]Search in Google Scholar
[8. <http://usainbolt.com>]Search in Google Scholar
