@techreport{Martin2009,
author = {Martin, J.A. and Hamilton, B. E. and Sutton, P.D. and Ventura, S.J. and Menacker, F. and Kirmeyer, S. and Matthews, T.J.},
title= {Births: Final data for 2006},
year = {2009},
publisher = {National Center for Health Statistics},
address = {National Vital Statistics Reports 57 (7). Hyattsville, MD},
}