Tzioumakis Γιάννης, Michalopoulou Μαρία, Aggelousis Νίκος, Papaioannou Αθανάσιος, and Christodoulidis Τριαντάφυλλος. 2009. “Youth Coaches Behavior Assessment Through Systematic Observation”. Inquiries in Physical Education and Sport 7 (3):344-54. https://doi.org/10.26253/heal.uth.ojs.ispe.2009.1338.