Aidil Putra, Budianto, Free Antonius Simanjuntak. IMPROVING BUSINESS COMMUNICATION AND NEGOTIATION SKILLS TO BUILD SELF-CONFIDENCE IN CHILDREN AT THE BENIH KEBAKAN POLONIA MEDAN ORPHANAGE. JCoS [Internet]. 2026 Jun. 1 [cited 2026 Jul. 21];3(2):12-2. Available from: https://journal.trasaka.com/index.php/JCoS/article/view/100