Cita APA (7a ed.)
Dean, M. Opportunities: Intermediate : Language Powerbook. Pearson.
Cita estilo Chicago (17a ed.)
Dean, Michael. Opportunities: Intermediate : Language Powerbook. Harlow, Inglaterra: Pearson.
Cita MLA (9a ed.)
Dean, Michael. Opportunities: Intermediate : Language Powerbook. Pearson.
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