[[Eric Kaufmann]] wrote about the problem of sub-fertility in the developed world in his book ''Whither the Child?: Causes and Consequences of Low Fertility''.<ref>[http://sociology.virginia.edu/publications/wilcox-whither-the-child Whither the Child? Causes and Consequences of Low Fertility], University of Virginia, Department of Sociology</ref> | [[Eric Kaufmann]] wrote about the problem of sub-fertility in the developed world in his book ''Whither the Child?: Causes and Consequences of Low Fertility''.<ref>[http://sociology.virginia.edu/publications/wilcox-whither-the-child Whither the Child? Causes and Consequences of Low Fertility], University of Virginia, Department of Sociology</ref> |