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* [http://publications.iwmi.org/pdf/H015867.pdf Program on Farmer-Managed Irrigation Systems and Support Services]. International Fund for Agricultural Development and the Bundesministerium fur Wirtschaftliche Zusammenarbeit und Entwicklung (BMZ) Government of the Federal Republic of Germany. October 1994. By the International Irrigation Management institute. Colombo, Sri Lanka.
* Jane Olley. [http://www.cd3wd.com/cd3wd_40/cd3wd/Practact/KnO-100410-human_animal_water_lifters.pdf HUMAN & ANIMAL POWERED WATER-LIFTING DEVICES FOR IRRIGATION.] Practical Action. November, 2008.
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