@book{U.S.2003,
author = {U.S., Office of Management and Budget },
title= {Revised definitions of metropolitan statistical areas, new definitions of micropolitan statistical areas and combined statistical areas, and guidance on use of the statistical definitions of these areas},
year = {2003},
address = {Washington, D.C.},
publisher = {Office of the President},
series = {Office of Management and Budget Bulletin, No. 03-04},
}