Downing, A. (1992). A university course in English grammar. New York: Prentice-Hall.
Trích dẫn kiểu ChicagoDowning, Angela. A University Course in English Grammar. New York: Prentice-Hall, 1992.
MLA citiranjeDowning, Angela. A University Course in English Grammar. New York: Prentice-Hall, 1992.
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