Sudaryono, ., . Prihastuti, and A. Wijanarko. “Land Suitability for Developing Soybean Crops in Bumi Nabung and Rumbia Districts, Central Lampung”. JOURNAL OF TROPICAL SOILS, vol. 16, no. 1, July 2013, pp. 85-92, doi:10.5400/jts.2011.v16i1.85-92.