Lubis, Risa Kartika, and Ahmad Zein. “Strategi Digital Marketing Jasa Fotografi (Analisis Akun Facebook @Sumatera Utara)”. Jurnal Sains dan Teknologi 6, no. 2 (August 12, 2024): 257–260. Accessed April 30, 2026. https://ejournal.sisfokomtek.org/index.php/saintek/article/view/3685.