@article{ref1,
title="What Makes a People Lethargic or Energetic?",
journal="American journal of sociology",
year="1913",
author="Ash, Isaac Emery",
volume="19",
number="3",
pages="370-379",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-9602",
doi="10.1086/212259",
url="http://dx.doi.org/10.1086/212259"
}