APA (7th ed.) Zitazioa

Covey, S. R. (2004). The seven habits of highly effective people ([2nd ed.].). Pocket Books.

Chicago Style (17th ed.) Zitazioa

Covey, Stephen R. The Seven Habits of Highly Effective People. [2nd ed.]. London: Pocket Books, 2004.

MLA (9th ed.) Zitazioa

Covey, Stephen R. The Seven Habits of Highly Effective People. [2nd ed.]. Pocket Books, 2004.