@article{ref1,
title="Drugs used by students: caffeine, tobacco, marihuana, cocaine and alcohol",
journal="Psychological reports",
year="1987",
author="Lester, David and Math, Y. S. and Guy, K. S. and Johnson, K. O.",
volume="61",
number="1",
pages="158-158",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0033-2941",
doi="",
url="http://dx.doi.org/"
}