The effects of basic tennis training given to secondary school students on stress, selfefficacy, and self-confidence levels. - Köroğlu, Mihraç; Çelik, Nuri Muhammed; Şişman, Burcu Yentürk; Soyer, Fikret (International Journal of Eurasia Social Sciences / Uluslararasi Avrasya Sosyal Bilimler Dergisi, 2026)