Cita APA (7a ed.)

Covey, S. R. (1993). The seven habits of highly effetive people (1a ed.). Simon & Schuster.

Cita Chicago Style (17a ed.)

Covey, Stephen R. The Seven Habits of Highly Effetive People. 1a ed. Londres: Simon & Schuster, 1993.

Cita MLA (9a ed.)

Covey, Stephen R. The Seven Habits of Highly Effetive People. 1a ed. Simon & Schuster, 1993.