@article{ref1,
title="Social versus edible rewards as a function of intellectual level and socioeconomic class",
journal="American journal of mental deficiency",
year="1972",
author="Tramontana, J.",
volume="77",
number="1",
pages="33-38",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}