APA aipamena

William Benton. (1968). The World Book Encyclopedia W-X-Y-Z, Volume 20. USA.

Chicago Style aipamena

William Benton. The World Book Encyclopedia W-X-Y-Z, Volume 20. USA, 1968.

MLA aipamena

William Benton. The World Book Encyclopedia W-X-Y-Z, Volume 20. USA, 1968.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.