munandar, Dadang, Dewi Indriani, Wentri Merdiani, Hendar Rubedo, and Nur Jamilah. “The Efficiency of the Role of Marketing Mix in Smartphone Business”. KnE Social Sciences 9, no. 2 (January 3, 2024): 890–899. Accessed July 18, 2024. https://knepublishing.com/index.php/KnE-Social/article/view/14908.