Pulungan, I. N. R., S. Kartosentono, and A. Prawita. “Validation Gas Chromatography-Fid Method for Analysis of Ethanol Content in Vinegar”. Journal of Halal Product and Research (JHPR), vol. 1, no. 2, Dec. 2018, pp. 22-31, doi:10.20473/jhpr.vol.1-issue.2.22-31.