APA aipamena

(1993). The world almanac and book of facts 1993. New York: St. Martin's.

Chicago Style aipamena

The World Almanac and Book of Facts 1993. New York: St. Martin's, 1993.

MLA aipamena

The World Almanac and Book of Facts 1993. New York: St. Martin's, 1993.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.