APA (7e ed.) Bronvermelding
Covey, S. R. (2004). The 7 habits of highly effective people. Pocket Books.
Chicago (17e ed.) Bronvermelding
Covey, Stephen R. The 7 Habits of Highly Effective People. London: Pocket Books, 2004.
MLA (9e ed.) Bronvermelding
Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.
Let op: Deze citaties zijn niet altijd 100% accuraat.