DjuniwatiS., HartonoA., and IndriyatiL. T., “The Effect of Organic Matter (Pueraria javanica) and Rock Phosphate on the Growth and P-uptake of Corn Plant (Zea mays) in Andisol Pasir Saronggae”, J. Il. Tan. Lingk., vol. 5, no. 1, pp. 17-22, Apr. 2003.