↑ Davis, J. G., and Kendall, P. "Preventing E. coli from Garden to Plate". Colorado State University. සම්ප්‍රවේශය 26 මාර්තු 2012.{{cite web}}:  CS1 maint: multiple names: authors list (link)↑ Li, Haiping; Tajkarimi, Mehrdad; Osburn, Bennie I (2008). "Impact of Vacuum Cooling on Escherichia coli O157:H7 Infiltration into Lettuce Tissue". Applied and Environmental Microbiology. 74 (10): 3138. doi:10.1128/AEM.02811.07.{{cite journal}}:  CS1 maint: multiple names: authors list (link)↑ Gajraj, Roger; Pooransingh, Shalini; Hawker, Jeremy; Olowokure, Babatunde (අප්‍රේල් 2012). "Multiple outbreaks of Salmonella braenderup associated with consumption of iceberg lettuce". International Journal of Environmental Health Research. 22 (2): 150–155. doi:10.1080/09603123.2011.613114.{{cite journal}}:  CS1 maint: multiple names: authors list (link)↑ 52.0 52.1 52.2 Watts, Donald (2007). Dictionary of Plant Lore. Academic Press. p. 226. ISBN 0-12-374086-X.↑ Duke, James A.; Duke, Peggy-Ann K.; DuCe