Covey Stephen R. (2004). 7 Habits of highly effective people. Pocket Books.
Style de citation Chicago (17e éd.)Covey Stephen R. 7 Habits of Highly Effective People. London: Pocket Books, 2004.
Style de citation MLA (9e éd.)Covey Stephen R. 7 Habits of Highly Effective People. Pocket Books, 2004.
Attention : ces citations peuvent ne pas être correctes à 100%.