@article{ref1,
title="Factors in the verbal and motor learning of imbeciles",
journal="Journal of psychology, The",
year="1971",
author="Al-issa, I.",
volume="77",
number="2d Half",
pages="151-156",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-3980",
doi="",
url="http://dx.doi.org/"
}