D. P. T. Baskoro and H. D. Manurung, “Effect ofMeasurement Method and Wet Sieving Time on Index of Soil Aggregate Stability”, J. Il. Tan. Lingk., vol. 7, no. 2, pp. 54–57, Oct. 2009, doi: 10.29244/jitl.7.2.54-57.