APA Citatie

Covey ,Stephen R. 7 habits of highly Effective People. Pocket Books.

Chicago Style citaat

Covey ,Stephen R. 7 Habits of Highly Effective People. London: Pocket Books.

MLA citatie

Covey ,Stephen R. 7 Habits of Highly Effective People. Pocket Books.

Let op: Deze citaties zijn niet altijd 100% accuraat.