Dyfyniad APA

(1997). Four communication skills in English. Đà Nẵng: Nxb. Đà Nẵng.

Dyfyniad Arddull Chicago

Four Communication Skills in English. Đà Nẵng: Nxb. Đà Nẵng, 1997.

Dyfyniad MLA

Four Communication Skills in English. Đà Nẵng: Nxb. Đà Nẵng, 1997.

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