@misc{U.S. National Center for Health Statistics2007,
author = {U.S. National Center for Health Statistics},
title= {Historical vital statistics of the United States},
year = {2007},
publisher = {U.S. Department of \linebreak Health and Human Services},
address = {Hyattsville},
note = {http://www.cdc.gov/nchs/products/pubs/pubd/vsus/historical/historical.htm (January 2007)},
}