Widjaja, A., Kinandana, G., Indrayani, A., & Antari, N. (2022). CORRELATION BETWEEN SMARTPHONE USAGE DURATION AND HANDGRIP STRENGTH IN ADOLESCENTS AGED 18-24 IN TULUNGAGUNG. Sport And Fitness Journal, 10(3), 206-214. doi:10.24843/spj.2022.v10.i03.p05