Abbay Master Plan Project, “Abbay River Basin Integrated Development Master Plan Project,” Ministry of Water Resource (MoWR), The Federal Democratic Republic of Ethiopia, BCEOM French Engineering Consultants in Association with ISL and BRGM April, 1999.
 S. L. Neitsch, J. G. Arnold, J. R. Kiniry and J. R. Williams, “Soil and Water Assessment Tools Theoretical Documentation,” Texas Water Resources Institute Technical Report No. 406, Texas A and M University System, Grassland, Soil and Water Research Laboratory, Texas, 2011, Blackland Research Center, Texas, 2005.
 K. C. Abbaspour, J. Yang, I. Maximov, R. Siber, K. Bogner, J. Mieleitner, J. Zobrist and R. Srinivasan, “Spatially-Distributed Modelling of Hydrology and Water Quality in the Prealpine/Alpine Thur Watershed Using SWAT,” Journal of Hydrology, Vol. 333, No. 2-4, 2007, pp. 413-430. http://dx.doi.org/10.1016/j.jhydrol.2006.09.014
 J. E. Nash and J. V. Sutcliffe, “River Flow Forecasting through Conceptual Models, Part I—A Discussion of Principles,” Journal of Hydrology, Vol. 10, No. 3, 1970, pp. 282-290. http://dx.doi.org/10.1016/0022-1694(70)90255-6