Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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