@article{ref1,
title="Token reinforcement of academic performance with institutionalized delinquent boys",
journal="Journal of educational psychology",
year="1968",
author="Tyler, V. O. Jr and Brown, G. D.",
volume="59",
number="3",
pages="164-168",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-0663",
doi="",
url="http://dx.doi.org/"
}