1. American Public Health Association Reducing Racial/Ethnic and Socioeconomic Disparities in Preterm and Low Birthweight Births (Policy No. 20062) 2006 http://www.apha.org/policies-and-advocacy/public-health-policy-statements/policy-database/2014/07/18/10/01/reducing-racial-ethnic-and-socioeconomic-disparities-in-preterm-and-low-birthweight-births
2. March of Dimes March of Dimes 2014 Premature Birth Report Card 2014 http://www.marchofdimes.org/materials/premature-birth-report-card-united-states.pdf
3. Preterm Births-United States, 2006 and 2010;Martin;CDC Health Disparities and Inequalities Report-United States, 2013,2013