Cita APA (7th ed.)

Covey, S. R. (1989). The seven habits of highly effective people: Restoring the character ethic. Simon and Schuster.

Cita Chicago (17th ed.)

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: Simon and Schuster, 1989.

Cita MLA (8th ed.)

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. Simon and Schuster, 1989.