APA (7th ed.) Zitazioa

Williams, A. (2012). Vocabulary for IELTS. HarperCollins Publishers.

Chicago Style (17th ed.) Zitazioa

Williams, Anneli. Vocabulary for IELTS. London: HarperCollins Publishers, 2012.

MLA (9th ed.) Zitazioa

Williams, Anneli. Vocabulary for IELTS. HarperCollins Publishers, 2012.