Thomas, A. (1970). A practical English grammer (2nd.). O U P.
Lua i Stíl Chicago (17ú heag.)Thomas, A. A Practical English Grammer. 2nd. London: O U P, 1970.
Lua MLA (9ú heag.)Thomas, A. A Practical English Grammer. 2nd. O U P, 1970.
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