Swan, M., & Walter, C. (1984). The Cambridge English course. Student's book 1. Cambridge University Press.
Cita Chicago Style (17a ed.)Swan, Michael, y Catherine Walter. The Cambridge English Course. Student's Book 1. Cambridge [Cambridgeshire]: Cambridge University Press, 1984.
Cita MLA (8a ed.)Swan, Michael, y Catherine Walter. The Cambridge English Course. Student's Book 1. Cambridge University Press, 1984.
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