Royani, M. A. U. R., and D. . Prapanca. “Effect of Product Quality, Promotion, Brand Image on Sales Increase: Pengaruh Kualitas Produk, Promosi, Brand Image Terhadap Peningkatan Penjualan”. Indonesian Journal of Innovation Studies, vol. 20, Sept. 2022, p. 10.21070/ijins.v20i.690, doi:10.21070/ijins.v20i.690.