@misc{United Nations Department of Economic and Social Affairs Population Division2015b,
author = {United Nations Department of Economic and Social Affairs Population Division},
title= {wpp2015: World population prospects 2015. R package version 1.0-0 },
year = {2015b},
URL = {http://cran.r-project.org/package=wpp2015 },
publisher = {Population Division, Department of Economic and Social Affairs, United Nations },
address = {New York},
}