(2004). The wrld amanac and book of facts 2004.
Chicago Style aipamenaThe Wrld Amanac and Book of Facts 2004. 2004.
MLA aipamenaThe Wrld Amanac and Book of Facts 2004. 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena