“Experimental Study of Demonstration Exercise Models on the Performance of Tennis Field Service Biomechanics: Studi Eksperimen Model Latihan Demonstration Terhadap Performa Biomekanika Service Tenis Lapangan ”. Procedia of Social Sciences and Humanities 3 (June 1, 2022): 250–255. Accessed January 10, 2026. https://pssh.umsida.ac.id/index.php/pssh/article/view/168.