APA (7th ed.) Citation

Lloyd M. Mark, Day J. Jeremy, & Ur P. Penny. (2011). Active Grammar: Level 3 with answers. Cambridge, Cambridge University Press, 2011.

Chicago Style (17th ed.) Citation

Lloyd M. Mark, Day J. Jeremy, and Ur P. Penny. Active Grammar: Level 3 with Answers. Cambridge, Cambridge University Press, 2011, 2011.

MLA (9th ed.) Citation

Lloyd M. Mark, et al. Active Grammar: Level 3 with Answers. Cambridge, Cambridge University Press, 2011, 2011.