Cita APA (7a ed.)
Davis, A. L. Commercial Correspondence for Students of English as a Second Language. Educational Services.
Cita estilo Chicago (17a ed.)
Davis, A. L. Commercial Correspondence for Students of English as a Second Language. Washington, EUA: Educational Services.
Cita MLA (9a ed.)
Davis, A. L. Commercial Correspondence for Students of English as a Second Language. Educational Services.
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