@article{ref1,
title="Changes in self concept and stated behavioral preferences",
journal="Child development",
year="1967",
author="Ludwig, D. J. and Maehr, M. L.",
volume="38",
number="2",
pages="453-467",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}