Aidil Putra, Budianto, and Free Antonius Simanjuntak. “IMPROVING BUSINESS COMMUNICATION AND NEGOTIATION SKILLS TO BUILD SELF-CONFIDENCE IN CHILDREN AT THE BENIH KEBAKAN POLONIA MEDAN ORPHANAGE”. Journal of Community Service 3, no. 2 (June 1, 2026): 12–22. Accessed July 21, 2026. https://journal.trasaka.com/index.php/JCoS/article/view/100.