APA (7e ed.) Bronvermelding

Hewings, M. (2009). Grammar for CAE and proficiency with answers: Self-study grammar reference and practice (1a. ed.). Cambridge University.

Chicago (17e ed.) Bronvermelding

Hewings, Martin. Grammar for CAE and Proficiency with Answers: Self-study Grammar Reference and Practice. 1a. ed. Cambridge: Cambridge University, 2009.

MLA (9e ed.) Bronvermelding

Hewings, Martin. Grammar for CAE and Proficiency with Answers: Self-study Grammar Reference and Practice. 1a. ed. Cambridge University, 2009.