Elly Romy and Mei Lisa 2026. Increasing Professionalism Through Effective Business Communication Training in the Digital Era at the Merah Putih Village Cooperative, STM Hulu District, Deli Serdang Regency. GANDRUNG: Jurnal Pengabdian Kepada Masyarakat. 7, 2 (Jul. 2026), 3228–3236. DOI:https://doi.org/10.36526/gandrung.v7i2.8526.