- Cărți electroniceThe 1997 CIA World FactbookUnited States. Central Intelligence Agency
- Cărți electroniceThe 1994 CIA World FactbookUnited States. Central Intelligence Agency
- Cărți electroniceThe 1991 CIA World FactbookUnited States. Central Intelligence Agency
- Cărți electroniceThe 1995 CIA World FactbookUnited States. Central Intelligence Agency