Van Koppen, Barbara; Sokile, Charles S.; Hatibu, Nuhu; Lankford, Bruce; Mahoo, Henry F.; Yanda, Pius Z.(International Water Management Institute, Colombo, Sri Lanka, 2004)
Hussain, Intizar; Raschid-Sally, Liqa; Hanjra, Munir A.; Marikar, Fuard; Van Der Hoek, Wim(International Water Management Institute, Colombo, Sri Lanka, 2001)