Immanuel Edy Suranta Sebayang. 2024. “Analysis of the Promotion Mix Strategy on the Number of Martabe Savings Customers at PT Bank Sumut, Tembung Branch Office”. Jurnal Indonesia : Manajemen Informatika Dan Komunikasi 5 (3), 2216-27. https://doi.org/10.35870/jimik.v5i3.866.