@article{ref1,
title="Building a tolerance for disagreement: an important goal in social studies instruction",
journal="Clearing house",
year="2005",
author="Martinson, David L.",
volume="78",
number="3",
pages="118-122",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0009-8655",
doi="10.3200/TCHS.78.3.118-122",
url="http://dx.doi.org/10.3200/TCHS.78.3.118-122"
}