Salwati, ., and B. B. Saidi. “Landform Classification Which Alighted from Digital Elevation Models: Case in Citarum Watershed, Cilalawi Sub Watershed, West Java”. JOURNAL OF TROPICAL SOILS, vol. 13, no. 2, May 2008, pp. 139-44, doi:10.5400/jts.2008.v13i2.139-144.