Adiprasetyo, Teguh, et al. “The Usage of BIOM3G-Biofertilizer to Improve and Support Sustainability of Land System of Independent Oil Palm Smallholders”. International Journal on Advanced Science, Engineering and Information Technology, vol. 4, no. 5, Oct. 2014, pp. 345-8, doi:10.18517/ijaseit.4.5.431.