Khalida, Azharia, et al. “Callus Induction of Aerides Odorata Lour. By Adding 2,4 Dichlorophenoxyacetic Acid (2,4-D)”. Jurnal Biologi UNAND, vol. 7, no. 2, Nov. 2019, pp. 109-17, doi:10.25077/jbioua.7.2.109-117.2019.