Roswiem, A. P., and D. N. Mustaqimah. “The Identification of Gelatin Source in Toothpaste Products Using Combination of Attenuated Total Reflection-Fourier Transform Infrared (ATR-FTIR) Spectroscopy and Chemometrics”. International Journal of Halal Research, Vol. 2, no. 1, June 2020, pp. 30-39, doi:10.18517/ijhr.2.1.30-39.2020.