@techreport{Martin2013,
author = {Martin, J. and Hamilton, B. and Osterman, M. and Curtin, S. and Mathews, T.},
title= {Births: Final data for 2012},
year = {2013},
URL = {http://www.cdc.gov/nchs/data/nvsr/nvsr62/nvsr62_09.pdf.},
publisher = {Centers for Disease Control and Prevention},
address = {Hyattsville},
number = {National vital statistics reports vol. 62, no. 9},
}