Covey Stephen R. (1999). The 7 habits of highly effective families: Building a beautiful family culture in a turbulent world. Simon & Schuster.
Παραπομπή σε μορφή Chicago (17η εκδ.)Covey Stephen R. The 7 Habits of Highly Effective Families: Building a Beautiful Family Culture in a Turbulent World. Simon & Schuster, 1999.
Παραπομπή σε μορφή MLA (8th εκδ.)Covey Stephen R. The 7 Habits of Highly Effective Families: Building a Beautiful Family Culture in a Turbulent World. Simon & Schuster, 1999.
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