Covey, S. R. (2004). The 7 Habits of Highly Effective People. Pocket Books.
Cita Chicago Style (17a ed.)Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.
Cita MLA (9a ed.)Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.
Precaución: Estas citas no son 100% exactas.