U.S. Department of State. [2018-09-17]. (原始内容存档于2019-12-26). Africa :: Angola — The World Factbook – Central IntelligenceAgency. www.cia.gov. [2018-12-14]
IntelligenceAgency (CIA) (IV). The World Factbook. The World Factbook. 2015 [2015-07-26]. (原始内容存档于2015-07-03). 中华人民共和国:Central IntelligenceAgency (CIA)
[2017-10-04]. (原始内容存档于2017-09-08). The World Factbook — Central IntelligenceAgency. www.cia.gov. [2018-10-15]. (原始内容存档于2015-09-18) (英语). Islam in Nepal
Factbook. cia.gov. Central IntelligenceAgency. [11 November 2019]. (原始内容存档于10 January 2021). East Asia/Southeast Asia :: Indonesia – The World Factbook.