Yuda, A. K., C. Resita, R. Nurwansyah, R. A. Gani, Z. Németh, and E. Setiawan. “Confidence, Academic Stress, Coping Strategies As Predictors of Student Academic Achievement in Physical Education Classes During Covid-19”. Physical Education Theory and Methodology, vol. 22, no. 2, June 2022, pp. 180-7, doi:10.17309/tmfv.2022.2.05.