APA (7th ed.) Citation

Canfield, Hansen, & Hewitt. (2000). The power of focus. Health Communications.

Chicago Style (17th ed.) Citation

Canfield, Hansen, and Hewitt. The Power of Focus. Deerfield Beach, Fla: Health Communications, 2000.

MLA (8th ed.) Citation

Canfield, et al. The Power of Focus. Health Communications, 2000.