Cita APA (7a ed.)

Gammidge, M. (2004). Speaking extra: A resource book of multi-level skills activities [AUDIO CD]. Cambridge University Press.

Cita Chicago Style (17a ed.)

Gammidge, Mick. Speaking Extra: A Resource Book of Multi-level Skills Activities [AUDIO CD]. Cambridge, United Kingdom: Cambridge University Press, 2004.

Cita MLA (9a ed.)

Gammidge, Mick. Speaking Extra: A Resource Book of Multi-level Skills Activities [AUDIO CD]. Cambridge University Press, 2004.