| Food and Agriculture Organization of the United Nations | — 19th century Irrigation in India• at the Water Quality Information Center, U |
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| A system of farming that creates wetland ecosystems on which food can be grown, while carbon is captured at a rate of up to 40 times higher than the same area of rainforest, and profits are more than eight times more profitable than the average potato field | O'Toole, Emer 29 July 2019 |
— 19th century Irrigation in India• Food and Agriculture Organization of the United Nations.
| — FAO's global information system on water and agriculture• McDill, Stuart November 27, 2019 | |
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