Acheson, Dean, author
Harvard University Press, 1958
Buku Teks
Fox, Annette Baker, 1912-, author
The University of Chicago Press, 1959
Buku Teks
Cleveland, Harland, author
Harper & Row, 1966
Buku Teks
Cleveland, Harland, author
Harper & Row, 1966
Buku Teks
Nicolson, Harold, author
Oxford, 1969
Buku Teks