Tawary, Muhammad, et al. “Analisis Kandungan Klorofil Pada Anak Daun Tanaman Kelapa (Analysis of Chlorophyll Content in Children Leaves of Coconut Plants)”. JURNAL BIOS LOGOS, vol. 9, no. 2, Sept. 2019, pp. 76-82, doi:10.35799/jbl.9.2.2019.24372.