Utari, R., B. Saputra, R. Kristiana, T. Yunita, V. Kusumaningtyas, and J. Jasmansyah. “Characteristics and Antioxidant Activity of Nanoparticles Chitosan Roselle (Hibiscus Sabdariffa)”. Jurnal Kartika Kimia, Vol. 5, no. 2, Nov. 2022, pp. 157-62, doi:10.26874/jkk.v5i2.180.