@article{ref1,
title="Interest Patterns as Related to Fields of Concentration Among Engineering Students",
journal="Journal of psychology, The",
year="1939",
author="Estes, S. G. and Horn, D.",
volume="7",
number="1",
pages="29-36",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0022-3980",
doi="10.1080/00223980.1939.9917618",
url="http://dx.doi.org/10.1080/00223980.1939.9917618"
}