Zalukh, Kiki Aguswan, et al. “Analisis Quality Control Dalam Menjaga Mutu Produk Caritas Gelas Pada Caritas Water Kota Gunungsitoli”. Innovative: Journal Of Social Science Research, vol. 3, no. 4, Sept. 2023, pp. 6136-47, https://j-innovative.org/index.php/Innovative/article/view/4239.