Hyon B. Shin; Robert A. Kominski. Language Use in the United States: 2007(PDF). United States Census Bureau. United States Department of Commerce. April 2010 [2013-05-27]. (原始内容存档(PDF)于2017-12-03).
Hyon B. Shin; Robert A. Kominski. Language Use in the United States: 2007(PDF). United States Census Bureau. United States Department of Commerce. April 2010 [2013-05-27]. (原始内容存档(PDF)于2017-12-03).