Cita APA (7a ed.)

Covey Stephen R. (2004). 7 Habits of highly effective people. Pocket Books.

Cita Chicago Style (17a ed.)

Covey Stephen R. 7 Habits of Highly Effective People. London: Pocket Books, 2004.

Cita MLA (9a ed.)

Covey Stephen R. 7 Habits of Highly Effective People. Pocket Books, 2004.