Lua APA (7ú heag.)

LEECH, G. (2007). A COMMUNICATIVE GRAMMAR OF ENGLISH, 3RD ED. Pearson.

Lua i Stíl Chicago (17ú heag.)

LEECH, G. A COMMUNICATIVE GRAMMAR OF ENGLISH, 3RD ED. New Delhi: Pearson, 2007.

Lua MLA (9ú heag.)

LEECH, G. A COMMUNICATIVE GRAMMAR OF ENGLISH, 3RD ED. Pearson, 2007.

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