Mayangsari, Simaibang, B. . and Mulyadi (2021) “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”, Jurnal Pendidikan Tambusai, 5(1), pp. 2521–2528. doi: 10.31004/jptam.v5i1.1701.