Firdhausya, T. F.; Zetra, Y.; Burhan, R. Y. P.; Putri, R. B.; Firdausa, Y. A. OPTIMIZATION OF REACTION TIME IN THE TRANSESTERIFICATION OF DISTILLED-WATER-WASHED USED COOKING OIL INTO FATTY ACID METHYL ESTERS. Walisongo J. Chem. 2026, 9, 148-158.