Nurfani, N., S. Rahayu, and B. Priyono. “The Relationship of Anxiety, Confidence, and Motivation to the Performance of Volleyball Referees: A Correlation Study”. JUARA : Jurnal Olahraga, Vol. 7, no. 2, July 2022, pp. 455-66, doi:10.33222/juara.v7i2.2038.