Arthika Putri, Nur, et al. “The Novel of Chitosan-Hydroxyapatite of Chicken Eggshells Composite As Methylene Blue Adsorbent”. Jurnal Riset Kimia, vol. 17, no. 1, Mar. 2026, pp. 27-34, doi:10.25077/jrk.v17i1.819.