References:

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· Appan, Adhityan: Opening Address at the 9th International Rainwater Catchment Systems Conference at Petrolina, Brazil, 6 to 9 July 1999.
· Cullis, Adrian and Pacey, Arnold, A Development Dialogue. Rainwater Harvesting in Turkana, London 1992.
· Fok, Yu-si, The Role of Rainwater Harvesting in the 21st Century, Proceedings of the 7th International Rainwater Catchment Systems Conference, Beijing, vol. 1, pp. 1:1-3. 1995.
· Gnadlinger, Johann, Rainwater Catchment in Brazil's Rural Semiarid Tropics: A Grassroots' Approach, 9th International Rainwater Catchment Systems Conference at Petrolina, Brazil, 6 to 9 July 1999.
· Gnadlinger, Johann, Technical Presentation of Various Types of Cisterns Built in the Rural Communities of the Semiarid Region of Brazil, 9th International Rainwater Catchment Systems Conference at Petrolina, Brazil, 6 to 9 July 1999.
· Gould, John and Nissen-Peterson, Erik, Rainwater Catchment Systems for Domestic Supply. Design, Construction and Implementation, London 1999.
· Mou, Haisheng et alii, Division Study of Rainwater Utilization in China, 9th International Rainwater Catchment Systems Conference at Petrolina, Brazil, 6 to 9 July 1999.
· Neugebauer, Bernd, Der Wandel kleinbäuerlicher Landnutzung in Oxkutzcab - Yucatán, Freiburg, 1986.
· Pacey, Arnold and Cullis, Adrian, Rainwater Harvesting. The collection of Rainfall and Runoff in Rural Areas, London, 1986.
· Porto, Everaldo Rocha et alii, Captação e Aproveitamento de Água de Chuva na Produção Agrícola dos Pequenos Produtores do Semi-árido Brasileiro, 9th International Rainwater Catchment Systems Conference at Petrolina, Brazil, 6 to 9 July 1999.
· Vieira, Vicente, Água Doce no Semi-Árido, in: Rebouças, Aldo et alii, Águas Doces no Brasil, São Paulo, 1999.
· World Bank, Water Resources Management. A World Bank Policy Paper, Washington, 1993.
· Zhu, Qiang and Yuanhong, Li: Rainwater Harvesting in the Loess Plateau of Gansu, China and its Significance, , 9th International Rainwater Catchment Systems Conference at Petrolina, Brazil, 6 to 9 July 1999.