APA-viite (7. p.)

Cambridge University Press. (2026). Cambridge IELTS 20 with Answers: Academic: Fully Update Version: Authentic Practice Tests (Fully Updated Version.). Cambridge University Press.

Chicago-viite (17. p.)

Cambridge University Press. Cambridge IELTS 20 with Answers: Academic: Fully Update Version: Authentic Practice Tests. Fully Updated Version. Cambridge: Cambridge University Press, 2026.

MLA-viite (9. p.)

Cambridge University Press. Cambridge IELTS 20 with Answers: Academic: Fully Update Version: Authentic Practice Tests. Fully Updated Version. Cambridge University Press, 2026.