Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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