References
Martin, J.A., Hamilton, B.E., & Ventura, S. J. (2013). Births: Final Data for 2012. Hyattsville, MD: National Center for Health Statistics. Retrieved January 21, 2014, from http://www.cdc.gov/nchs/data/nvsr/nvsr62/nvsr62_09.pdf
Hamilton, B. E., Mathews, M. S., & Ventura, S. J. (2013). Declines in state teen birth rates by race and Hispanic origin. Hyattsville, MD: National Center for Health Statistics. Retrieved January