Sitanggang, Augustinus S, Dean Simanjuntak, Ahmad Faisal, Maruli Sihombing, Enjel Jaya Rajagukguk, and Santi Rohdearni Panjaitan. 2024. “The Influence of Location, Price and Promotion on Decisions to Use Shipping Services AT SPX Express Pematangsiantar”. ProBisnis : Jurnal Manajemen 15 (6):261-69. https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/731.