APA
Gould M. B. J., . (2016). Collins Cambridge Checkpoint English – Stage 9: Student Book. : HarperCollins UK.
Chicago
Gould Mike Burchell Julia, . 2016. Collins Cambridge Checkpoint English – Stage 9: Student Book. : HarperCollins UK.
Harvard
Gould M. B. J., . (2016). Collins Cambridge Checkpoint English – Stage 9: Student Book. : HarperCollins UK.
MLA
Gould Mike Burchell Julia, . Collins Cambridge Checkpoint English – Stage 9: Student Book. : HarperCollins UK. 2016.