@article{ref1,
title="Relationship of trait anxiety, peer presence, task difficulty, and skill acquisition of sixth-grade boys",
journal="Research quarterly",
year="1977",
author="Kieffer, L. F.",
volume="48",
number="3",
pages="550-561",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0034-5377",
doi="",
url="http://dx.doi.org/"
}