@article{ref1,
title="The subject as a source of bias in psychological research",
journal="Journal of general psychology",
year="1969",
author="Lester, David",
volume="81",
number="2d Half",
pages="237-248",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0022-1309",
doi="",
url="http://dx.doi.org/"
}