Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

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

Style de citation MLA (8e éd.)

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