Matthews, Donald R.
The University of North Carolina Press, 1960
Buku Teks
Baker, Ross K., author
Free Press, 1980
Buku Teks
Burdette, Franklin L., author
Princeton, Princeton University Press
Buku Teks
Kennedy, John F. (John Fitzgerald), 1917-1963, author
Harper & Row, 1955
Buku Teks
Shannon, William V., author
Macmillan, 1967
Buku Teks