Cassara, Ernestt, author
Gale Research Coompany, 1977
Buku Teks
Oscar Handlin ... [et.al] author
Belknap Press, 1963
Buku Teks
Risjord, Norman K., author
Prentice-Hall, 1985
Buku Teks
Williams, T. Harry, author
Alfred A. Knopf, 1963
Buku Teks
Beard, Charles A., author
New Home Library, 1944
Buku Teks