Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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