Pratama, Rivan Saghita, Sri Haryono, Abdul Hafidz, Ali Md Nadzalan, Jaffry Bin Zakaria, Teguh Santosa, Sunanto Sunanto, Agus Himawan, Nur Ahmad Muharram, and Septyaningrum Putri Purwoto. 2025. “Content Validity of Android-Based Sport Training Program Monitor For Tennis Players ”. Sport and Tourism Central European Journal 8 (2):49–61. https://doi.org/10.16926/sit.2025.02.03.