Cita APA (7th ed.)

Roberts, R., Gakonga, J., & Preshous, A. (2004). IELTS foundation: Student's book. Macmillan Education.

Cita Chicago (17th ed.)

Roberts, Rachael, Joanne Gakonga, i Andrew Preshous. IELTS Foundation: Student's Book. Oxford: Macmillan Education, 2004.

Cita MLA (8th ed.)

Roberts, Rachael, et al. IELTS Foundation: Student's Book. Macmillan Education, 2004.