Seftiana, Defi, and Khafi Puddin. “PENGARUH KUALITAS PRODUK DAN KUALITAS PELAYANAN TERHADAP LOYALITAS PELANGGAN KAYANA.IDN STABAT, KABUPATEN LANGKAT SUMATERA UTARA”. IKRAITH-EKONOMIKA 8, no. 2 (July 31, 2025): 1637-1646. Accessed October 9, 2025. https://journals.upi-yai.ac.id/index.php/IKRAITH-EKONOMIKA/article/view/5240.