Nurhasnawati, Veni Veronica Siregar, and Siti Fatonah. “Verbal and No-Verbal Reinforcement Approacher Is Emotion Control to Increase Self-Confidence of Elementary School Students”. Jurnal Ilmiah Sekolah Dasar 6, no. 3 (June 5, 2022): 501–508. Accessed July 17, 2024. https://ejournal.undiksha.ac.id/index.php/JISD/article/view/45329.