APA (7th ed.) Citation

Canfield, J., Hewitt, L., & Hansen, M. V. (2011). The power of focus (10th anniversary ed.). Health Communication, Inc.

Chicago Style (17th ed.) Citation

Canfield, Jack, Les Hewitt, and Mark Victor Hansen. The Power of Focus. 10th anniversary ed. Deefield Beach: Health Communication, Inc, 2011.

MLA (8th ed.) Citation

Canfield, Jack, et al. The Power of Focus. 10th anniversary ed. Health Communication, Inc, 2011.