Herdiansyah Herdiansyah, Teguh Satria, Yusuf Dwi Meirianto, Wulan Nurlaela, and Devtio Dwiwahyudi, “Instructional Models and Self-efficacy in Karate Training: A Factorial Study of Kumite Skill Development”, JPJ, vol. 7, no. 2, pp. 314–328, Oct. 2026.