@article{ref1,
title="A Meta-Analysis of the Effect of Parent Effectiveness Training",
journal="American journal of family therapy",
year="1990",
author="Cedar, Bruce and Levant, Ronald F.",
volume="18",
number="4",
pages="373-384",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0192-6187",
doi="",
url="http://dx.doi.org/"
}