APA (7e ed.) Bronvermelding
Covey R. Stephen. (1997). The 7 habits of highly effective people. Pocket Books.
Chicago (17e ed.) Bronvermelding
Covey R. Stephen. The 7 Habits of Highly Effective People. London: Pocket Books, 1997.
MLA (9e ed.) Bronvermelding
Covey R. Stephen. The 7 Habits of Highly Effective People. Pocket Books, 1997.
Let op: Deze citaties zijn niet altijd 100% accuraat.