PRATIWI E, SUHARJANA, DHARMA HITA IPA, SARI HP, ARIESTIKA E. Indonesia’s Badminton National Referees: What is The Level of Self-Confidence and Concentration?. Innovare J Edu [Internet]. 2022 Jan. 1 [cited 2024 May 4];10(1):7-12. Available from: https://journals.innovareacademics.in/index.php/ijoe/article/view/43398