Thomson, A. (1970). A practical English grammer Economics 1 to 6. O U P.
Lua i Stíl Chicago (17ú heag.)Thomson, A. A Practical English Grammer Economics 1 to 6. London: O U P, 1970.
Lua MLA (9ú heag.)Thomson, A. A Practical English Grammer Economics 1 to 6. O U P, 1970.
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