Cita APA (7th ed.)
(1989). The world factbook 1989 (ed.). Central Intelligence Agency.
Cita Chicago (17th ed.)
The World Factbook 1989. ed. Washington: Central Intelligence Agency, 1989.
Cita MLA (9th ed.)
The World Factbook 1989. ed. Central Intelligence Agency, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.