Khory FD, Istiyono E, Widihastuti W, Suroto S, Maksum A, Hartoto S, et al. Development and validation of a self-efficacy instrument for university students in swimming lesson. Intjssh [Internet]. 2026 Feb. 9 [cited 2026 Mar. 8];. Available from: https://journals.kmanpub.com/index.php/Intjssh/article/view/4823