A. A. Niha, N. Khuriyati, and A. D. Guritno, “Formula optimization of herbal drink based on coconut sugar and ginger using the Taguchi method [Optimasi formula minuman herbal berbasis gula merah dan jahe menggunakan metode Taguchi]”, JTIHP, vol. 29, no. 2, pp. 176–189, Aug. 2024.