Matheus, Rupa, and Donatus Kantur. “Perbaikan Kualitas Kimia Vertisol Melalui Pemberian Bahan Organik Mucuna, Crotolaria, Dan Dosis Pupuk Hayati”. Jurnal Ilmu Pertanian Indonesia, vol. 27, no. 3, July 2022, pp. 444-53, https://doi.org/10.18343/jipi.27.3.444.