APA

U.S. Citizenship and Immigration Services, . (2011). I'm a proud American =: Soy americano con orgullo. [Washington, D.C.]: U.S. Citizenship and Immigration Services.

Chicago

U.S. Citizenship and Immigration Services, . 2011. I'm a proud American =: Soy americano con orgullo. [Washington, D.C.]: U.S. Citizenship and Immigration Services.

Harvard

U.S. Citizenship and Immigration Services, . (2011). I'm a proud American =: Soy americano con orgullo. [Washington, D.C.]: U.S. Citizenship and Immigration Services.

MLA

U.S. Citizenship and Immigration Services, . I'm a proud American =: Soy americano con orgullo. [Washington, D.C.]: U.S. Citizenship and Immigration Services. 2011.