Παραπομπή APA

Hewings, M. (2013). Advanced grammer in use (2nd.). CUP.

Παραπομπή Chicago Style

Hewings, Martin. Advanced Grammer in Use. 2nd. Cambridge: CUP, 2013.

Παραπομπή MLA

Hewings, Martin. Advanced Grammer in Use. 2nd. CUP, 2013.