Mati, Bancy M.; Muchiri, John M.; Njenga, Kennedy; Penning de Vries, F.W.T.; Merrey, Douglas J.(International Water Management Institute, Colombo, Sri Lanka, 2006)
Vermillion, Douglas L.; Samad, Madar; Pusposutardjo, Suprodjo; Arif, Sigit S.; Rochdyanto, Saiful(International Water Management Institute (IWMI), Colombo, Sri Lanka, 2000)
Theesfeld, Insa; Boevsky, Ivan(Central and Eastern European Sustainable Agriculture (CEESA), Humboldt University of Berlin, Department of Agricultural Economics and Social Sciences, Berlin, Germany, 2003)
Van Koppen, Barbara; Sokile, Charles S.; Hatibu, Nuhu; Lankford, Bruce; Mahoo, Henry F.; Yanda, Pius Z.(International Water Management Institute, Colombo, Sri Lanka, 2004)