“ANALISIS PENGARUH ATRIBUT PRODUK TERHADAP LOYALITAS KONSUMEN KRIM PEMUTIH WAJAH ‘TJE FUK’ DI YOGYAKARTA”. Jurnal Optimal, vol. 5, no. 3, Dec. 2017, pp. 265-74, https://jurnal.stieieu.ac.id/index.php/opt/article/view/58.