1. Factors affecting the efficiency of washing procedures used in the production of prepared salads;Adams;Food Microbiol,1989
2. Difficulties in eliminating human pathogenic microorganisms on raw fruits and vegetables;Beuchat;Acta Hort,2004
3. CA-LGMA 2007 Commodity specific food safety guidlines for the production and harvest of lettuce and leafy greens http://www.caleafygreens.ca.gov/members/documents/LGMAAcceptedGAPs06.13.08.pdf
4. Curiale M 2004 MPN calculator (VB6 version) for food, feed, and water microbiologist http://www.i2workout.com/mcuriale/mpn/index.html