McCarthy, M., McCarten, J., & Sendiford, H. (2005). Touchstone: Self-study audio CD/CD-ROM Level 1A. Cambridge University Press.

McCarthy, Michael, Jeanne McCarten, and Helen Sendiford. Touchstone: Self-study Audio CD/CD-ROM Level 1A. Cambridge: Cambridge University Press, 2005.

McCarthy, Michael, et al. Touchstone: Self-study Audio CD/CD-ROM Level 1A. Cambridge University Press, 2005.