Aidil Putra, Budianto and Free Antonius Simanjuntak (2026) “IMPROVING BUSINESS COMMUNICATION AND NEGOTIATION SKILLS TO BUILD SELF-CONFIDENCE IN CHILDREN AT THE BENIH KEBAKAN POLONIA MEDAN ORPHANAGE”, Journal of Community Service, 3(2), pp. 12–22. Available at: https://journal.trasaka.com/index.php/JCoS/article/view/100 (Accessed: 21 July 2026).