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)
Vermillion, Douglas L.; Samad, Madar; Pusposutardjo, Suprodjo; Arif, Sigit S.; Rochdyanto, Saiful(International Water Management Institute (IWMI), Colombo, Sri Lanka, 2000)