1. Screening life cycle assessment (LCA) of tomato ketchup: a case study;Andersson;J. Clean. Prod.,1998
2. Belson, K., 2010. Keeping Trucks Full, Coming and Going. NY Times, Business Section (April 21).
3. Bureau of Labor Statistics (BLS), 2010. Consumer Price Index All Urban Consumers – (CPI-U) Unites States Department of Labor. (accessed 20.02.10).
4. Burger, M., Horwath, W.R., 2012. Assessment of Baseline Nitrous Oxide Emissions in California Cropping Systems. Final Report: California Air Resources Board Contract No. 08-324. (accessed 02.04.13).
5. California Climate and Agriculture Network (CalCAN), 2011. The Climate Benefits of Organic Agriculture. CalCAN. .