1. AWE (Alliance for Water Efficiency) 2015 Water Offset Policies for Water-Neutral Community Growth www.allianceforwaterefficiency.org/net-blue.aspx
2. Christiansen , W. 2015 Journal AWWA, https://doi.org/10.5942/jawwa.2015.107.0026
3. CMR (Code of Massachusetts Regulations) www.grafton-ma.gov/sites/graftonma/files/uploads/314cmr07.pdf 2017
4. Water Shortage May Force West Yellowstone Building Moratorium;Dietrich;Bozeman Daily Chronicle,2016