APA (7th ed.) Zitazioa

GRAVER, B. (1971). Advanced english practice (2nd ed.). O.U.P.

Chicago Style (17th ed.) Zitazioa

GRAVER, B.D. Advanced English Practice. 2nd ed. London: O.U.P, 1971.

MLA (9th ed.) Zitazioa

GRAVER, B.D. Advanced English Practice. 2nd ed. O.U.P, 1971.