APA

Hopkins D., Cullen P., . (2007). Cambridge grammar for IELTS with answers : self-study grammar reference and practice. Cambridge: Cambridge University Press.

Chicago

Hopkins Diana, Cullen Pauline, . 2007. Cambridge grammar for IELTS with answers : self-study grammar reference and practice. Cambridge: Cambridge University Press.

Harvard

Hopkins D., Cullen P., . (2007). Cambridge grammar for IELTS with answers : self-study grammar reference and practice. Cambridge: Cambridge University Press.

MLA

Hopkins Diana, Cullen Pauline, . Cambridge grammar for IELTS with answers : self-study grammar reference and practice. Cambridge: Cambridge University Press. 2007.