Hacker, S., & Roberts, T. (2003). Transformational leadership: Creating organizations of meaning. ASQ Quality Press.

Hacker, Stephen, and Tammy Roberts. Transformational Leadership: Creating Organizations of Meaning. Milwaukee, Wisconsin: ASQ Quality Press, 2003.

Hacker, Stephen, and Tammy Roberts. Transformational Leadership: Creating Organizations of Meaning. ASQ Quality Press, 2003.