@article{ref1,
title="Social and Ethical Interpretations of Mental Development",
journal="American journal of sociology",
year="1899",
author="Caldwell, W.",
volume="5",
number="2",
pages="182-192",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-9602",
doi="10.1086/210881",
url="http://dx.doi.org/10.1086/210881"
}