Aggelos, S., M. A, D. V, and G. A. “The Influence of Visual and Hearing Stimuli on the Performance of Young Tennis Athletes Aged 12-15 Years”. INTERNATIONAL JOURNAL OF RESEARCH IN EDUCATION METHODOLOGY, vol. 7, no. 5, July 2016, pp. 1362-8, doi:10.24297/ijrem.v7i5.4334.