“PENGARUH KUALITAS LAYANAN ELEKTRONIK (E-SERVQUAL) TERHADAP KEPUASAN KONSUMEN PADA MARKET PLACE SHOPEE DI SLEMAN DIY”. Jurnal Optimal, vol. 18, no. 1, Feb. 2021, pp. 41-62, https://jurnal.stieieu.ac.id/index.php/opt/article/view/122.