APA

POWELL D., . (2005). Common mistakes at CAE ... and how to avoid them. Cambridge: Cambridge University Press.

Chicago

POWELL Debra, . 2005. Common mistakes at CAE ... and how to avoid them. Cambridge: Cambridge University Press.

Harvard

POWELL D., . (2005). Common mistakes at CAE ... and how to avoid them. Cambridge: Cambridge University Press.

MLA

POWELL Debra, . Common mistakes at CAE ... and how to avoid them. Cambridge: Cambridge University Press. 2005.