Zetou, E., Koronas, V., Athanailidis, I. and Koussis, P. 2012. Learning tennis skill through game play and stay in elementary pupilsls. Journal of Human Sport and Exercise. 7, 2 (Jul. 2012), 560–572. DOI:https://doi.org/10.4100/jhse.2012.72.19.