APA (7th ed.) Citation

Davis F. Fiona, Rimmer W. Wayne, & Ur P. Penny. (2011). Active Grammar: Level 2 with answers. Cambridge, Cambridge University Press, 2011.

Chicago Style (17th ed.) Citation

Davis F. Fiona, Rimmer W. Wayne, and Ur P. Penny. Active Grammar: Level 2 with Answers. Cambridge, Cambridge University Press, 2011, 2011.

MLA (9th ed.) Citation

Davis F. Fiona, et al. Active Grammar: Level 2 with Answers. Cambridge, Cambridge University Press, 2011, 2011.