@article{Sampson1999,
author = {Sampson, R.J. and Morenoff, J.D. and Earls, F.},
title= {Beyond social capital: Spatial dynamics of collective efficacy for children},
year = {1999},
doi = {10.2307/2657367},
journal = {American Sociological Review},
volume = {64},
number = {5},
pages = {633--660},
}