Keenan, George F., author
Harper & Row, 1964
Buku Teks
Eckstein, Alexander, author
Free Press, 1961
Buku Teks
Barnett, Arthur Doak, author
Frederick A. Praeger, 1963
Buku Teks
Skilling, Gordon H., author
Thomas Y. Crowell, 1966
Buku Teks
Rostow, Walt Whitman, author
John Wiley & Sons, 1955
Buku Teks