Litwack, Leon, author
Prentice-Hall, 1962
Buku Teks
Adams, Walter, 1922-1998, author
Prentice-Hall, 2001
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1965
Buku Teks
Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1955
Buku Teks
U.S. Information Service,, 1981
Buku Teks