Lestari, R., Rahadian, A., Amrulloh, A., & Taufik, M. (2020). The Relationship Of Mental Thoughness And Competitive Anxiety With Karate Referee Performance. Jp.Jok (Jurnal Pendidikan Jasmani, Olahraga Dan Kesehatan), 4(1), 98-108. https://doi.org/10.33503/jp.jok.v4i1.1147