COVEY, S. R. (1997). The seven habits of highly effective people. Jakarta: Binarupa Aksara.
Παραπομπή Chicago StyleCOVEY, Stephen R. The Seven Habits of Highly Effective People. Jakarta: Binarupa Aksara, 1997.
Παραπομπή MLACOVEY, Stephen R. The Seven Habits of Highly Effective People. Jakarta: Binarupa Aksara, 1997.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.