Waruwu, W., Harefa, I., Mendrofa, Y., & Zebua, E. (2025). The Application of Marketing Mix in Increasing Sales at the Integrated Training and Skills Development Center (PLKT) BNKP Gunungsitoli. ProBisnis : Jurnal Manajemen, 16(4), 642–646. Retrieved from https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/1030