Cita APA (7a ed.)

(1990). Great Britain. Introducing Includes Teacher's Notes and Workbook Key. Oxford, Longman, 1990.

Cita Chicago Style (17a ed.)

Great Britain. Introducing Includes Teacher's Notes and Workbook Key. Oxford, Longman, 1990, 1990.

Cita MLA (9a ed.)

Great Britain. Introducing Includes Teacher's Notes and Workbook Key. Oxford, Longman, 1990, 1990.