@article{ref1,
title="Prediction enhancement through the use of moderator variables",
journal="Journal of consulting and clinical psychology",
year="1969",
author="Cowden, J. E.",
volume="33",
number="5",
pages="621-624",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-006X",
doi="",
url="http://dx.doi.org/"
}