APA (7th ed.) Citation

Zigarmi, D., Blanchard, K., Edeburn, C., & O'Connor, M. The Leader Within: Learning Enough About Yourself to Lead Others.

Chicago Style (17th ed.) Citation

Zigarmi, Drea, Ken Blanchard, Carl Edeburn, and Michael O'Connor. The Leader Within: Learning Enough About Yourself to Lead Others.

MLA (8th ed.) Citation

Zigarmi, Drea, et al. The Leader Within: Learning Enough About Yourself to Lead Others.