APA (7th ed.) Citation

Preston, D. J., Wilson, L., & Sowers, S. (2009). Impact. Macmillan Audio.

Chicago Style (17th ed.) Citation

Preston, Douglas J., Laura Wilson, and Scott Sowers. Impact. [United States]: Macmillan Audio, 2009.

MLA (9th ed.) Citation

Preston, Douglas J., et al. Impact. Macmillan Audio, 2009.