Indriani, Reni, et al. “Effect of Subculture Frequency Toward Growth And Carotenoid Content from Tomato (Lycopersicon Esculentum Mill.) Callus”. Jurnal Biodjati, vol. 5, no. 2, Nov. 2020, pp. 303-15, doi:10.15575/biodjati.v5i2.5840.