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)
Khoa, Sophie Nguyen; Smith, Laurence; Lorenzen, Kai; Garaway, Caroline; Perera, L. R.; de Silva, Shyamalie; Kumara, M. M .C.; Amarasinghe, Upali A.; Kularatne, M. G.; Bandara, H. M. S. Chandana(2003)
Cai, Xueliang; Sharma, Bharat R.; Matin, Mir Abdul; Sharma, Devesh; Gunasinghe, Sarath(International Water Management Institute (IWMI), Colombo, Sri Lanka, 2010)