APA aipamena

United States. Central Intelligence Agency. (1968). Bulgaria: 5-68. [Washington.

Chicago Style aipamena

United States. Central Intelligence Agency. Bulgaria: 5-68. [Washington, 1968.

MLA aipamena

United States. Central Intelligence Agency. Bulgaria: 5-68. [Washington, 1968.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.