APA (7th ed.) Citation

United States. Central Intelligence Agency. (1991). The 1990 CIA World Factbook. Project Gutenberg.

Chicago Style (17th ed.) Citation

United States. Central Intelligence Agency. The 1990 CIA World Factbook. Project Gutenberg, 1991.

MLA (9th ed.) Citation

United States. Central Intelligence Agency. The 1990 CIA World Factbook. Project Gutenberg, 1991.

Warning: These citations may not always be 100% accurate.