@article{ref1,
title="Theory and Practice of Applied Social-Research",
journal="Evaluation quarterly",
year="1978",
author="Wright, SR and Wright, James D. and Rossi, Peter H.",
volume="2",
number="2",
pages="171-191",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0145-4692",
doi="",
url="http://dx.doi.org/"
}