- Электронная книгаThe 1997 CIA World FactbookUnited States. Central Intelligence Agency
- Электронная книгаThe 1994 CIA World FactbookUnited States. Central Intelligence Agency
- Электронная книгаThe 1991 CIA World FactbookUnited States. Central Intelligence Agency
- Электронная книгаThe 1995 CIA World FactbookUnited States. Central Intelligence Agency