Raharjo, Hardi Rahmat, et al. “Fermented Kasgot and SP 36 Fertilizer As Inputs for Purple Corn Cultivation in Ultisol Soil”. Jurnal Ilmu Pertanian Indonesia, vol. 30, no. 2, Mar. 2025, pp. 406-15, https://doi.org/10.18343/jipi.30.2.406.