Tzioumakis Γ., Michalopoulou Μ., Aggelousis Ν., Papaioannou Α., and Christodoulidis Τ. “Youth Coaches Behavior Assessment Through Systematic Observation”. Inquiries in Physical Education and Sport, vol. 7, no. 3, Dec. 2009, pp. 344-5, doi:10.26253/heal.uth.ojs.ispe.2009.1338.