Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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