- Libro electrónicoThe 1996 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1990 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1994 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1992 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1998 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1997 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1991 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1995 CIA World FactbookUnited States. Central Intelligence Agency
- Libro electrónicoThe 1993 CIA World FactbookUnited States. Central Intelligence Agency