Julian R, Kristiyanto A, Purnama SK. Mental Skill Tennis Referee: Study On Tennis Referee Asian Games And Asian Para Games Indonesia 2018. J Educ Health Sport [Internet]. 2019 Apr. 2 [cited 2024 Sep. 1];9(4):210-9. Available from: https://apcz.umk.pl/JEHS/article/view/6777