Les 7 habitudes de ceux qui réalisent tout ce qu'ils entreprennent / Stephen R. Covey,
1991
wikipedia.org, 2012-07-22
Information trouvée : tephen Richards Covey (October 24, 1932 – July 16, 2012) was an American educator,
author, businessman and motivational speaker. His most popular book was The Seven
Habits of Highly Effective People.