Central IntelligenceAgency. www.cia.gov. [2018-12-14]. (原始内容存档于2017-09-20). Europe :: Albania — The World Factbook – Central IntelligenceAgency. www.cia
language; Field Listing - Languages. The World Factbook. Central IntelligenceAgency. [2009-01-11]. (原始内容存档于2014-03-07). Society. Government Information
(原始内容存档于2021-08-24) (美国英语). Nigeria prevalence rate. [September 21, 2019]. (原始内容存档于2021-08-24). NationalAgency for the Control of AIDS. Abuja, Nigeria. Global AIDS
and Filipinos living abroad (OFW) [1] (页面存档备份,存于互联网档案馆) Central IntelligenceAgency. Filipino Statistics: US Archive.is的存檔,存档日期2020-02-12 US Census Bureau