APA

Peter Pam,, . (2004). The cambridge guide to English usage. Cambridge: Cambridge University Press.

Chicago

Peter Pam,, . 2004. The cambridge guide to English usage. Cambridge: Cambridge University Press.

Harvard

Peter Pam,, . (2004). The cambridge guide to English usage. Cambridge: Cambridge University Press.

MLA

Peter Pam,, . The cambridge guide to English usage. Cambridge: Cambridge University Press. 2004.