1. The Foreign-Born Population in the United States,2011
2. QuickFacts,2010
3. 2015 Language Map App. Limited English Proficiency (LEP). 2015. Accessed 1 October 2020. https://www.lep.gov/demog_data/demog_data.html.
4. Detailed Languages Spoken at Home and Ability to Speak English for the Population 5 Years and over: 2009–2013,2015