1. Bryce E. Wildlife forced out of California ‘salad bowl’ by food safety regulations. The Guardian
2. California Department of Public Health (2007) Investigation of an Escherichia coli O157:H7 Outbreak associated with dole pre-packaged spinach.
http://www.cdph.ca.gov
3. Centers for Disease Control and Prevention (2011) Estimates of foodborne illness in the United States.
www.cdc.gov/foodborneburden/
. Accessed 25 Sept 2014
4. Centers for Disease Control and Prevention (2006) Multistate outbreak of E. coli O157:H7 infections linked to fresh spinach (final update).
www.cdc.gov/ecoli/2006/spinach-10-2006.html.
Accessed 25 Sept 2015
5. UC ANR Cooperative Extension (2012) Balancing food safety and sustainability – opportunities for co-management.
http://ucfoodsafety.ucdavis.edu/files/157154.pdf