@techreport{ONS2007,
author = {ONS},
title= {Birth statistics. Review of the Registrar General on births and patterns of family building England and Wales, 2006},
year = {2007},
URL = {http://www.statistics.gov.uk/downloads/theme_population/FM1_35/FM1_No35.PDF},
publisher = {Office of National Statistics},
address = {London},
number = {Series FM1, No. 35},
}