@article{Lindgren2009,
author = {Lindgren, M.},
title= {Documentation for age at first marriage of women for countries and territories},
year = {2009},
URL = {http://www.gapminder.org/wp-content/uploads/2008/10/gapdoc009.pdf},
journal = {Gapminder Documentation},
volume = {009},
pages = {Retrieved March 28, 2014},
}