edited by Quentin H. Stanford
Oxford University Press, 1972
Buku Teks
New American Library, 1972
Buku Teks
Woytinsky, W.S.
The Twentieth Century Fund, 1953
Buku Teks
Bouvier, Leon F., author
Seven Lucks Press, 1999
Buku Teks
United Nations
United Nations, 1986
Buku Teks