APA (7th ed.) Zitazioa

Williams, A. (2019). Writing for IELTS (Second edition.). HarperCollins.

Chicago Style (17th ed.) Zitazioa

Williams, Anneli. Writing for IELTS. Second edition. London: HarperCollins, 2019.

MLA (9th ed.) Zitazioa

Williams, Anneli. Writing for IELTS. Second edition. HarperCollins, 2019.