U.S. Census Bureau: The official statistics web site. 〈http: //www.census.gov/〉: By U.S.Department of Commerce. Washington, DC: The Agency. Site examined on August 16-21, 1997. - Barbara Levergood (Gov. Inf. Q., 1998)

The Specification of the Language of the Field and Interoperability: Cross-language Access to Catalogues and Online Libraries (CACAO). - Barbara Levergood; Stefan Farrenkopf; Elisabeth Frasnelli (Dublin Core Conference, 2008)