Cita APA (7a ed.)

Covey, S. (1992). The seven habits of highly effective people. Simon & Schuster.

Cita Chicago Style (17a ed.)

Covey, Stephen. The Seven Habits of Highly Effective People. London: Simon & Schuster, 1992.

Cita MLA (9a ed.)

Covey, Stephen. The Seven Habits of Highly Effective People. Simon & Schuster, 1992.