@article{ref1,
title="The Scope of Sociology, VII. Classification of Associations",
journal="American journal of sociology",
year="1901",
author="Small, Albion W.",
volume="6",
number="4",
pages="487-531",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-9602",
doi="10.1086/210993",
url="http://dx.doi.org/10.1086/210993"
}