NAPITUPULU, Runggu Besmandala; 						HUTABARAT, Lamminar; 						GULTOM, Lilis Suriani.
 ENHANCING CUSTOMER LOYALTY – EMPIRICAL EVIDENCE FROM Y SERIES VIVO SMARTPHONE ON MEDAN.
<strong>Jurnal Darma Agung</strong>, [S.l.], v. 32, n. 3, p. 1-14, june 2024.
ISSN 2654-3915.
Available at: &lt;<a href="https://jurnal.darmaagung.ac.id/index.php/jurnaluda/article/view/4394" target="_new">https://jurnal.darmaagung.ac.id/index.php/jurnaluda/article/view/4394</a>&gt;. Date accessed: 23 nov. 2024.
doi: <a href="http://dx.doi.org/10.46930/ojsuda.v32i3.4394">http://dx.doi.org/10.46930/ojsuda.v32i3.4394</a>.