Cita APA (7th ed.)
Villarreal, O., Lethaby, C., Rodri<U+00CC><U+0081>guez, M. S., & Battersby, A. (1999). POLIMODAL english students̐ book 3. Macmillan Heinemann.
Cita Chicago (17th ed.)
Villarreal, Omar, Carol Lethaby, Maria S. Rodri<U+00CC><U+0081>guez, i Alan Battersby. POLIMODAL English Students̐ Book 3. Madrid: Macmillan Heinemann, 1999.
Cita MLA (9th ed.)
Villarreal, Omar, et al. POLIMODAL English Students̐ Book 3. Macmillan Heinemann, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.