APA (7th ed.) Citation

Brinton, E., & Plumb, W. (1980). Active context English. Book 3. The Macmillan Press Limited.

Chicago Style (17th ed.) Citation

Brinton, Ethel, and Walter Plumb. Active Context English. Book 3. Londres: The Macmillan Press Limited, 1980.

MLA (9th ed.) Citation

Brinton, Ethel, and Walter Plumb. Active Context English. Book 3. The Macmillan Press Limited, 1980.