Guerra, L. C.; Bhuiyan, S. I.; Tuong, T. P.; Barker, Randolph(System-Wide Initiative on Water Management (SWIM), International Water Management Institute, Colombo, Sri Lanka, 1999)
Mahoo, Henry F.; Mkoga, Zakaria J.; Kasele, Sydney Stephen; Igbadun, Henry E.; Hatibu, Nuhu; Rao, Karuturi P. C.; Lankford, Bruce(International Water Management Institute, Colombo, Sri Lanka, 2008)