Cita APA (7a ed.)
Covey, S. R. (1990). Principle centered leadership. Simon & Schuster.
Cita Chicago Style (17a ed.)
Covey, Stephen R. Principle Centered Leadership. London: Simon & Schuster, 1990.
Cita MLA (9a ed.)
Covey, Stephen R. Principle Centered Leadership. Simon & Schuster, 1990.
Precaución: Estas citas no son 100% exactas.