McGuire, Edna
Macmillan, 1954
Buku Teks
Califano, Joseph A.
W.W.Norton and Company, 1931
Buku Teks
Olsen, Edward A, author
Praeger Security International, 2005
Buku Teks
Hardgrave, Robert L., author
Harcourt, Brace, 1970
Buku Teks
Kennedy, John F
Evanston, 1964
Buku Teks