Cita APA (7th ed.)

Covey Stephen R. (2004). Seven habits Of Highly Effective People. Simon Schuster.

Cita Chicago (17th ed.)

Covey Stephen R. Seven Habits Of Highly Effective People. London: Simon Schuster, 2004.

Cita MLA (9th ed.)

Covey Stephen R. Seven Habits Of Highly Effective People. Simon Schuster, 2004.