@article{ref1,
title="Peers as social reinforcers",
journal="Child development",
year="1964",
author="Patterson, G. R. and Anderson, D.",
volume="35",
number="",
pages="951-960",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}