APA

United States, . (2012). Estimates of the size and characteristics of the resident nonimmigrant population in the United States. [Washington, D.C.]: U.S. Department of Homeland Security, Office of Immigration Statistics.

Chicago

United States, . 2012. Estimates of the size and characteristics of the resident nonimmigrant population in the United States. [Washington, D.C.]: U.S. Department of Homeland Security, Office of Immigration Statistics.

Harvard

United States, . (2012). Estimates of the size and characteristics of the resident nonimmigrant population in the United States. [Washington, D.C.]: U.S. Department of Homeland Security, Office of Immigration Statistics.

MLA

United States, . Estimates of the size and characteristics of the resident nonimmigrant population in the United States. [Washington, D.C.]: U.S. Department of Homeland Security, Office of Immigration Statistics. 2012.