Ireson, Gren
Reflective reader : secondary science
Learning Matters, 2006
 Buku Teks
American government
by Susan Welch ... [and others]
Thomson, 2006
 Buku Teks
Sayre, Wallace S.
American government
Barnes & Noble, 1964
 Buku Teks
Posey, Rollin Bennett
American government
Littlefield, Adam, 1958
 Buku Teks
Ferguson, John H.
The American system of government
McGraw-Hill, 1947
 Buku Teks