Santosa, E., A. D. Susila, A. P. Lontoh, Y. Mine, and N. Sugiyama. “NPK Levels and Application Methods on Productivity of Amorphophallus Muelleri Blume in Intercropping System”. Jurnal Jamu Indonesia, vol. 1, no. 2, Sept. 2016, pp. 1-8, doi:10.29244/jji.v1i2.12.