Latham-Koenig, C., Oxenden, C., & Lambert, J. (2018). English File: Elementary Teacher`s guide with teacher`s resource centre (Fourth Edition.). Oxford.
Cita Chicago Style (17a ed.)Latham-Koenig, Christina, Clive Oxenden, y Jerry Lambert. English File: Elementary Teacher`s Guide with Teacher`s Resource Centre. Fourth Edition. United Kingdom: Oxford, 2018.
Cita MLA (8a ed.)Latham-Koenig, Christina, et al. English File: Elementary Teacher`s Guide with Teacher`s Resource Centre. Fourth Edition. Oxford, 2018.
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