I. Oktavia and G. R. Affandi, “Achievement Motivation and Competitive Anxiety Among Taekwondo Athletes: Motivasi Prestasi dan Kecemasan Kompetitif di Kalangan Atlet Taekwondo”, acopen, vol. 10, no. 1, p. 10.21070/acopen.10.2025.13333, Feb. 2026.