Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.