U.S. Citizenship and Immigration Services. (2012). Tarjetas de educación cívica para el examen de naturalizacíon. U.S. Dept. of Homeland Security, U.S. Citizenship and Immigration Services : For sale by the Supt. of Docs., U.S. G.P.O..
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)U.S. Citizenship and Immigration Services. Tarjetas De Educación Cívica Para El Examen De Naturalizacíon. [Washington, D.C.]: U.S. Dept. of Homeland Security, U.S. Citizenship and Immigration Services : For sale by the Supt. of Docs., U.S. G.P.O., 2012.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)U.S. Citizenship and Immigration Services. Tarjetas De Educación Cívica Para El Examen De Naturalizacíon. U.S. Dept. of Homeland Security, U.S. Citizenship and Immigration Services : For sale by the Supt. of Docs., U.S. G.P.O., 2012.