APA Citatie

Covey, S. R. (1999). Seven habits of highly effective people (1st.). Pocket books.

Chicago Style citaat

Covey, Stephen R. Seven Habits of Highly Effective People. 1st. London: Pocket books, 1999.

MLA citatie

Covey, Stephen R. Seven Habits of Highly Effective People. 1st. Pocket books, 1999.

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