Narto, Narto. “Pengukuran Tingkat Kualitas Pelayanan Pit-Stop Kopi Gresik”. Jurnal INTECH Teknik Industri Universitas Serang Raya, vol. 5, no. 1, June 2019, pp. 11-16, https://doi.org/10.30656/intech.v5i1.1453.