Cita APA (7a ed.)
Soars, J., & Soars, L. (1997). Headway. Pre-Intermediate. Workbook. With Key (14th impression.). Oxford University Press.
Cita Chicago Style (17a ed.)
Soars, John, y Liz Soars. Headway. Pre-Intermediate. Workbook. With Key. 14th impression. Oxford: Oxford University Press, 1997.
Cita MLA (9a ed.)
Soars, John, y Liz Soars. Headway. Pre-Intermediate. Workbook. With Key. 14th impression. Oxford University Press, 1997.
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