@book{Santos2011,
author = {Santos, A. and McGuckin, N. and Nakamoto, H.Y. and Gray, D. and Liss, S.},
title= {Summary of travel trends: 2009 National Household Travel Survey},
year = {2011},
address = {Washington, D.C},
publisher = {U.S. Department of Transportation Federal Highway Administration (FHWA)},
}