Cita APA (7a ed.)

Collie J. Joanne & Slater S. Stephen. (1993). Speaking 4. New York, Cambridge University Press, 1993.

Cita Chicago Style (17a ed.)

Collie J. Joanne y Slater S. Stephen. Speaking 4. New York, Cambridge University Press, 1993, 1993.

Cita MLA (9a ed.)

Collie J. Joanne y Slater S. Stephen. Speaking 4. New York, Cambridge University Press, 1993, 1993.