Kinasih, Rengganis Wulan, et al. “Reduction of Tannins in Black Tea Using Rice Husk Ash: An Innovation to Reduce The Risk of Iron Deficiency Anemia: Rengganis Wulan Kinasih, Nadira Mais Fayyaza, Binar Panunggal, Nurmasari Widyastuti, Dewi Marfu’ah Kurniawati”. Jurnal Persada Husada Indonesia, vol. 13, no. 2, June 2026, pp. 9-16, doi:10.56014/jphi.v13i2.500.