Allan, D. (2004). Placement test 1: Listening test. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoAllan, Dave. Placement Test 1: Listening Test. Oxford: Oxford University Press, 2004.
Deismireacht MLAAllan, Dave. Placement Test 1: Listening Test. Oxford: Oxford University Press, 2004.
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