Arisandra, Martha Laila, and Nanda Nanta Kusuma. “OPTIMIZATION OF SHARIAH-BASED DIGITAL MARKETING STRATEGY TO INCREASE SMARTFREN BRAND LOYALTY THROUGH CUSTOMER ENGAGEMENT ACCORDING TO ISLAMIC ECONOMIC CONCEPT”. ADILLA : Jurnal Ilmiah Ekonomi Syari’ah, vol. 9, no. 1, Apr. 2026, https://ejournal.unisda.ac.id/index.php/adilla/article/view/7177.