Cita APA (7a ed.)

Covey, S. R. (1992). Principle-centered leadership. Simon & Schuster.

Cita Chicago Style (17a ed.)

Covey, Stephen R. Principle-centered Leadership. New York, N.Y.: Simon & Schuster, 1992.

Cita MLA (8a ed.)

Covey, Stephen R. Principle-centered Leadership. Simon & Schuster, 1992.