Mayangsari, Simaibang B, Mulyadi. The Correlations Among Self-Confidence, Learning Motivation, and Speaking Ability of The Eleventh Grade Students Of State Vocational High School 1 of Talang Ubi Pali. jptam [Internet]. 2021 Aug. 28 [cited 2024 Jul. 3];5(1):2521-8. Available from: https://jptam.org/index.php/jptam/article/view/1701