@article{ref1,
title="Childhood and the evolution of the human life course",
journal="Human nature",
year="2002",
author="Bock, John and Sellen, Daniel W.",
volume="13",
number="2",
pages="153-159",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1045-6767",
doi="10.1007/s12110-002-1006-5",
url="http://dx.doi.org/10.1007/s12110-002-1006-5"
}