Trích dẫn APA

O'Connell,Sue. (1989). Focus on Proficiency: Revied and Enlarged ed. with Exam Practice Material. London: Collins E.L.T.

Chicago Style Citation

O'Connell,Sue. Focus On Proficiency: Revied and Enlarged Ed. With Exam Practice Material. London: Collins E.L.T, 1989.

Trích dẫn MLA

O'Connell,Sue. Focus On Proficiency: Revied and Enlarged Ed. With Exam Practice Material. London: Collins E.L.T, 1989.

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