Siti Azilah Atan, Mohammad Fazrul Jafar, Mohd Syrinaz Azli, Jorrye Jakiwa, and Mohar Kassim. 2021. “THE RELIABILITY OF RATING PERCEIVED EXERTION AND THE RELATIONSHIP WITH HEART RATE IN YOUNG SOCCER PLAYERS”. Zulfaqar Journal of Defence Management, Social Science & Humanities 4 (1). https://zulfaqarjdmssh.upnm.edu.my/index.php/zjdmssh/article/view/61.