United Nations
United Nations, 1987
Buku Teks
Chen, Kuan I., author
Bookman Associates, 1960
Buku Teks
Stockwin, J.A.A., author
W.W. Norton, 1982
Buku Teks
Stockwin, J.A.A., author
Weidenfeld and Nicolson, 1975
Buku Teks
New American Library, 1972
Buku Teks