TARISA WINA LAKSMANA; NOVITA SARI; SOFIAH. Strategi GraPARI Jember dalam Mengoptimalkan Penawaran Upgrade Layanan IndiHome. ISTIKHLAF: Jurnal Ekonomi, Perbankan dan Manajemen Syariah, [S. l.], v. 8, n. 1, p. 146–161, 2026. DOI: 10.51311/istikhlaf.v8i1.1455. Disponível em: https://ejurnal.iaiyasnibungo.ac.id/index.php/istikhlaf/article/view/1455. Acesso em: 5 nov. 2026.