Cita APA (7th ed.)

Matthews, M., & Salisbury, K. (2011). IELTS practice tests plus 3: With key. Pearson Education.

Cita Chicago (17th ed.)

Matthews, Margaret, i Katy Salisbury. IELTS Practice Tests Plus 3: With Key. Pearson Education, 2011.

Cita MLA (9th ed.)

Matthews, Margaret, i Katy Salisbury. IELTS Practice Tests Plus 3: With Key. Pearson Education, 2011.