Cita APA (7a ed.)

Howe, D. H. A. (1992). English today! 4. Oxford University Press.

Cita Chicago Style (17a ed.)

Howe, D H Autor. English Today! 4. Oxford: Oxford University Press, 1992.

Cita MLA (9a ed.)

Howe, D H Autor. English Today! 4. Oxford University Press, 1992.