@article{ref1,
title="Calls for Police Assistance: Consumer Demands for Governmental Service",
journal="American behavioral scientist",
year="1970",
author="Bercal, TE",
volume="13",
number="5-6",
pages="681-691",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-7642",
doi="",
url="http://dx.doi.org/"
}