APA-viite (7. p.)

Sahanaya, W., & Hughes, T. (2002). IELTS preparation and practice: Practice test with annotated answer key. Oxford University press.

Chicago-viite (17. p.)

Sahanaya, Wendy, ja Terri Hughes. IELTS Preparation and Practice: Practice Test with Annotated Answer Key. Oxford: Oxford University press, 2002.

MLA-viite (8. p.)

Sahanaya, Wendy, ja Terri Hughes. IELTS Preparation and Practice: Practice Test with Annotated Answer Key. Oxford University press, 2002.