Doris Yolanda Saragih, Hengki Mangiring Parulian Simarmata, E. Sirait, R. S. Saragih, and S. M. Sihite, “International Collaboration in Business English Learning: Enhancing Global Communication Skills of Polytechnic Students ”, Jurnal Bersama Pengabdian Kepada Masyarakat (SAMAMAS), vol. 1, no. 4, pp. 160–167, Dec. 2025.