Munro, William Bennett, author
Buku Teks
Munro, William Bennett, author
Macmillan, 1952
Buku Teks
Hamilton, Alexander, author
Tudor Publishing, 1937
Buku Teks
United Nations
United Nations Department of Public Information, 2002
Buku Teks
Goodrich, Leland M., author
Stevens & Sons, 1949
Buku Teks