http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Negative mood and urban versus rural residence
using proximity to metropolitan statistical areas as an alternative measure of residence
National Center for Health Statistics (U.S.)
Includes bibliographical references (pages 10-11).
Advance data from vital and health statistics of the National Center for Health Statistics ; no. 281