Style de citation APA

Covey, S. R. (1989). The 7 habits of highly effective people: Restoring the character ethic. Pocket books.

Style de citation Chicago

Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. London: Pocket books, 1989.

Style de citation MLA

Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Pocket books, 1989.

Attention : ces citations peuvent ne pas être correctes à 100%.