Cita APA (7a ed.)
Covey, S. R. (1991). Principle-centered leadership. Pocket books.
Cita Chicago Style (17a ed.)
Covey, Stephen R. Principle-centered Leadership. London: Pocket books, 1991.
Cita MLA (9a ed.)
Covey, Stephen R. Principle-centered Leadership. Pocket books, 1991.
Precaución: Estas citas no son 100% exactas.