Cita APA (7a ed.)

Covey, S. R. (1990). The Seven habits of Highly Effective People: Restoring the Character Ethic. Simon & Schuster.

Cita Chicago Style (17a ed.)

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York London ...: Simon & Schuster, 1990.

Cita MLA (9a ed.)

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. Simon & Schuster, 1990.