Soars J. John & Soars L. Liz. (2003). New Headway English Course: Pre-Intermediate; Student's Book (12-th ed.). New York, Oxford University Press, 2003.
Cita Chicago (17th ed.)Soars J. John i Soars L. Liz. New Headway English Course: Pre-Intermediate; Student's Book. 12-th ed. New York, Oxford University Press, 2003, 2003.
Cita MLA (9th ed.)Soars J. John i Soars L. Liz. New Headway English Course: Pre-Intermediate; Student's Book. 12-th ed. New York, Oxford University Press, 2003, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.