McCarthy, M., McCarten, J., & Sandiford, H. (2005). Touchstone: Class audio level 2. Cambridge University Press.

McCarthy, Michael, Jeanne McCarten, and Helen Sandiford. Touchstone: Class Audio Level 2. Cambridge: Cambridge University Press, 2005.

McCarthy, Michael, et al. Touchstone: Class Audio Level 2. Cambridge University Press, 2005.