@article{ref1,
title="Methodology, birth order, intelligence, and personality",
journal="American psychologist, The",
year="2001",
author="Shackelford, T. K. and Michalski, R. L.",
volume="56",
number="6-7",
pages="520-521",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-066X",
doi="",
url="http://dx.doi.org/"
}