1. Statistics Canada 2011 Census of Canada: Topic-based tabulations. Age Group of Child, Census Family Structure and Sex for the Children in Census Families in Private Households of Canada, Provinces, Territories, Census Metropolitan Areas and Census Agglomerations, 2006 and 2011 Censuses
2. The American family today. http://www.pewsocialtrends.org/2015/12/17/1-the-american-family-today/ . Accessed March 10, 2016
3. Australian Bureau of Statistics. 4442.0 - Family Characteristics, Australia, 2012–13. http://www.abs.gov.au/ausstats/abs@.nsf/mf/4442.0 . Accessed 26 Apr 2016
4. Finch N. Demographic Trends in the UK. Social Policy Research Unit. University of York. https://www.york.ac.uk/inst/spru/research/nordic/ukdemo.PDF . Accessed 26 Apr 2016
5. Office for National Statistics. Review of the National Statistician on marriages and divorces in 2006, and adoptions in 2007, in England and Wales. Section 4.8. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/228619/9787777148227.pdf.Accessed 26 Apr 2016