Cita APA (7a ed.)
Soars, L., & Soars, J. American Headway: Workbook 1. Oxford University.
Cita estilo Chicago (17a ed.)
Soars, Liz, y John Soars. American Headway: Workbook 1. Nueva York, EUA: Oxford University.
Cita MLA (9a ed.)
Soars, Liz, y John Soars. American Headway: Workbook 1. Oxford University.
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