Zebua PB, Telaumbanua A, Mendrofa Y, Bate’e MM. The Effect of Promotion on Mobile Phone Purchase Decisions at CV Tricomsel Gunungsitoli-Nias. ProBisnis [Internet]. 2025 Oct. 11 [cited 2026 Aug. 5];16(5):1197-202. Available from: https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/1140