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| web | Laura Allen And Cleo Woelfle-E... | Mother Earth News | 2023-06-05 | |
| web | Greywater Action | 2018-02-02 | ||
| web | Water Environment Research | 2013-07-01 | ||
| web | Hari Srinivas | 2013-03-21 | ||
| web | Innovative Water Solutions | 2013-03-21 | ||
| web | Doug Pushard | HarvestH2O.com | 2013-03-21 | |
| web | Organization of American State... | 2013-03-01 | ||
| web | Water Environment Research Fou... | |||
| web | R.K. Misra, J.H. Patel and V.R... | Australian Centre for Sustaina... |