Handika, Willy, et al. “PENGARUH LAYANAN PURNA JUAL DAN KUALITAS PRODUK TERHADAP KEPUASAAN PELANGGAN SMARTPHONE SAMSUNG DI JAKARTA”. Global Research and Innovation Journal, vol. 2, no. 3, Sept. 2026, pp. 671-8, https://journaledutech.com/index.php/great/article/view/1571.