@article{ref1,
title="Growth and development of Negro infants: IV. Motor development and its relationship to child rearing practices in two groups of Negro infants",
journal="Child development",
year="1953",
author="Williams, J. R. and Scott, R. B.",
volume="24",
number="2",
pages="103-121",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}