APA aipamena

(1981). World English. Orlando, FL: Harcourt, Brace International.

Chicago Style aipamena

World English. Orlando, FL: Harcourt, Brace International, 1981.

MLA aipamena

World English. Orlando, FL: Harcourt, Brace International, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.