Manik, T.K. 2013. Land Surface Evaluation Using Unit Hydrograph Methods at Way Besai Watershed, Sumberjaya, West Lampung, Indonesia. JOURNAL OF TROPICAL SOILS. 16, 1 (Jul. 2013), 69–76. DOI:https://doi.org/10.5400/jts.2011.v16i1.69-76.