Waruwu, Frisca Angela, Emanuel Zebua, Yuterlin Zalukhu, and Idarni Harefa. “Marketing Mix Strategy in Efforts to Increase Drug Sales at the Healthy Pharmacy in Gunungsitoli City, Produced by PT Kalbe Farma Tbk”. ProBisnis : Jurnal Manajemen 15, no. 2 (April 30, 2024): 274–278. Accessed September 28, 2024. http://ejournal.joninstitute.org/index.php/ProBisnis/article/view/543.