EVA MARGARETH SARAH; NISCAYA HIA; ANGGI KRISTINA SINAGA. Pengaruh Kualitas Pelayanan dan Relationship Marketing terhadap Kepuasan Pelanggan PT. PLN (Persero) Unit Layanan Pelanggan Medan Helvetia. MAMEN: Jurnal Manajemen, [S. l.], v. 4, n. 3, p. 309–316, 2025. DOI: 10.55123/mamen.v4i3.5334. Disponível em: https://journal.literasisains.id/index.php/mamen/article/view/5334. Acesso em: 7 mar. 2026.