Palapa, Neza Rahayu, Taher, Tarmizi, Mohadi, Risfidian, AND Lesbani, Aldes. " Removal of Anionic Direct Dye Using Zn/Al, Zn/Fe and Zn/Cr Layered Double Hydroxides Toward Interlayer Distance" Science and Technology Indonesia [Online], Volume 4 Number 3 (31 July 2019)