@article{Putnam2007,
author = {Putnam, R.D.},
title= {E pluribus unum: Diversity and community in the twenty‐first century: The 2006 Johan Skytte Prize Lecture},
year = {2007},
doi = {10.1111/j.1467-9477.2007.00176.x},
volume = {30},
number = {2},
pages = {137--174},
}