1. Environmental Impacts of Agricultural Technologies. Evans School of Public Affairs. University of Washingtonhttp://econ.washington.edu/files/2014/06/2010-Environmental-Impacts-of-Ag-Technologies.pdf
2. Agriculture and Environment. MTT Agrifood Research Finlandhttp://ec.europa.eu/research/agriculture/scar/pdf/scar_foresight_environment_en.pdf
3. Crop Calendar Dataset. Center for Sustainability and the Global Environment. University of Wisconsin-Madisonhttp://www.sage.wisc.edu/download/sacks/crop_calendar.html
4. The United Nations World Water Development Report 3: Water in a Changing World,2009
5. Hydroponic Lettuce Handbookhttp://www.cornellcea.com/attachments/Cornell CEA Lettuce Handbook.pdf