Lua APA (7ú heag.)

SWAN , M. (1982). PRACTICAL ENGLISH USAGE. OXFORD UNI. PRESS.

Lua i Stíl Chicago (17ú heag.)

SWAN , MICHAEL. PRACTICAL ENGLISH USAGE. BOMBAY: OXFORD UNI. PRESS, 1982.

Lua MLA (9ú heag.)

SWAN , MICHAEL. PRACTICAL ENGLISH USAGE. OXFORD UNI. PRESS, 1982.

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