@article{ref1,
title="Social class trends in the practices and attitudes of college students regarding sex, smoking, drinking, and the use of drugs",
journal="Journal of school health",
year="1971",
author="Althoff, S. A. and Nussel, E. J.",
volume="41",
number="7",
pages="390-394",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4391",
doi="",
url="http://dx.doi.org/"
}