@article{ref1,
title="Comparative accuracy of recognizing American and international road signs",
journal="Journal of applied psychology",
year="1965",
author="Walker, R. E. and Nicolay, R. C. and Stearns, C. R.",
volume="49",
number="5",
pages="322-325",
abstract="Abstract unavailable.",
language="",
issn="0021-9010",
doi="",
url="http://dx.doi.org/"
}