@book{United Nations2017,
author = {United Nations},
title= {World marriage data 2017},
year = {2017},
URL = {https://www.un.org/en/development/desa/population/theme/marriage-unions/WMD2017.asp},
address = {New York},
publisher = {Department of Economic and Social Affairs, Population Division},
series = {Department of Economic and Social Affairs, Population Division},
}