Chalmer, Bruce J.
Marcel Dekker, 1987
Buku Teks
Volpe, E. Peter (Erminio Peter)
Universal Books Stall, 1996"
Buku Teks
Corwin, Edward S.
William Sloane, 1949
Buku Teks
Corwin, Edward S.
United States of America, 1960
Buku Teks
Dubois, Bernard
Prentice-Hall, 2000
Buku Teks