Wily, Liz Alden(Expert Group on Development Issues (EGDI) and United Nations University World Institute for Development Economics Research (WIDER), 2004)
Van Koppen, Barbara; Sokile, Charles S.; Hatibu, Nuhu; Lankford, Bruce; Mahoo, Henry F.; Yanda, Pius Z.(International Water Management Institute, Colombo, Sri Lanka, 2004)