Cita APA (7th ed.)
Covey, S. R. (2004). The 7 Habits of Highly Effective People (25th Anniversary Edition.). Pocket Books.
Cita Chicago (17th ed.)
Covey, Stephen R. The 7 Habits of Highly Effective People. 25th Anniversary Edition. London: Pocket Books, 2004.
Cita MLA (9th ed.)
Covey, Stephen R. The 7 Habits of Highly Effective People. 25th Anniversary Edition. Pocket Books, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.