Nugraha, Samuel Setya, and Adhita Maharani Dewi. “The Influence of Marketing Mix on The Increase of Billing Sales Volume in Freedom Internet Cafe, Surakarta”. ProBisnis : Jurnal Manajemen 15, no. 5 (October 30, 2024): 276–283. Accessed May 8, 2026. https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/559.