Waruwu, W., Harefa, I., Mendrofa, Y. and 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), pp. 642–646. Available at: https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/1030 (Accessed: 18 April 2026).