Cita APA (7a ed.)

Palmer, G. (2004). Writing extra: A resource book of multi-level skills activities. Cambridge University Press.

Cita Chicago Style (17a ed.)

Palmer, Gill. Writing Extra: A Resource Book of Multi-level Skills Activities. Cambridge, United Kingdom: Cambridge University Press, 2004.

Cita MLA (9a ed.)

Palmer, Gill. Writing Extra: A Resource Book of Multi-level Skills Activities. Cambridge University Press, 2004.