↑ Central Intelligence Agency (2007-04-25). "Intelligence & Analysis – Products". สืบค้นเมื่อ 2010-10-23. The DI publishes unclassified reference aids that are available to the public. The annual World Factbook is a comprehensive compendium of profiles on more than 260 countries and other entities. (Archived by WebCite at http://www.webcitation.org/5th2WIAtu)
↑ Directorate of Intelligence (2011-07-12). "CIA – World Factbook". สืบค้นเมื่อ 2011-07-14. The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.
↑ Directorate of Intelligence. "The World Factbook – Contributors and Copyright Information". สืบค้นเมื่อ 2006-09-23. The World Factbook is prepared by the Central Intelligence Agency for the use of US Government officials, and the style, format, coverage, and content are designed to meet their specific requirements. Information is provided by ... other public and private sources. The Factbook is in the public domain. Accordingly, it may be copied freely without permission of the Central Intelligence Agency (CIA).
↑ "CIA World Factbook 2006 Now Available" (Press release). Central Intelligence Agency. 2006-04-05. สืบค้นเมื่อ 2007-01-11. The World Factbook remains the CIA's most widely disseminated and most popular product, now averaging almost 6 million visits each month. In addition, tens of thousands of government, commercial, academic, and other Web sites link to or replicate the online version of the Factbook. * * * Included among the 271 geographic entries is one for the "World," which incorporates data and other information summarized where possible from the other 270 country listings.
