@article{ref1,
title="Some of obligation to high school activities as related to school size and marginality of student",
journal="Child development",
year="1967",
author="Willems, E. P.",
volume="38",
number="4",
pages="1247-1260",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}