APA

Hashemi L., Thomas B., . (2010). Cambridge Grammar for PET with answers. Cambridge: Cambridge University Press.

Chicago

Hashemi L, Thomas B, . 2010. Cambridge Grammar for PET with answers. Cambridge: Cambridge University Press.

Harvard

Hashemi L., Thomas B., . (2010). Cambridge Grammar for PET with answers. Cambridge: Cambridge University Press.

MLA

Hashemi L, Thomas B, . Cambridge Grammar for PET with answers. Cambridge: Cambridge University Press. 2010.