Cita APA (7a ed.)

Barker, P. (1987). Author languages for CAL. Macmillan Education.

Cita Chicago Style (17a ed.)

Barker, P. Author Languages for CAL. London [etc.]: Macmillan Education, 1987.

Cita MLA (9a ed.)

Barker, P. Author Languages for CAL. Macmillan Education, 1987.