@article{ref1,
title="Effects of task difficulty, race of administrator, and instruction on digit-symbol performance of negroes",
journal="Journal of personality and social psychology",
year="1965",
author="Katz, Ira and Roberts, S. O. and Robinson, J. M.",
volume="34",
number="",
pages="53-59",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-3514",
doi="",
url="http://dx.doi.org/"
}