1. CDC. Final estimates for 2009-10 seasonal influenza and influenza A (H1N1) 2009 monovalent vaccination coverage-United States, August 2009 through May 2010 http://www.cdc.gov/flu/professionals/vaccination/coverage_0910estimates.htm
2. CDC Flu vaccination coverage, United States, 2011-12 influenza season http://www.cdc.gov/flu/professionals/vaccination/coverage_1112estimates.htm 2013
3. The health belief model: A decade later;Janz;Health Education & Behavior,1984