Djangaopa, J.T., Mambu, S.M. and Nio, S.A. 2020. Variations in Leaf Chlorophyll Concentration in Croton Plants (Codiaeum variegatum L.) Cultivar Gelatik at a Different Leaf Age. Jurnal Ilmiah Sains. 20, 2 (Jun. 2020), 78–87. DOI:https://doi.org/10.35799/jis.20.2.2020.28397.