Inouye, Daniel K.
Prentice-Hall, 1967
Buku Teks
Obama, Barack, author
Ufuk Press, 2009
Buku Teks
Seronsy, Cecil, author
Twayne, 1967
Buku Teks
Thelen, David P.
Little, Brown and Company, 1976
Buku Teks
Shannon, William V., author
Macmillan, 1967
Buku Teks