Παραπομπή APA

Covey, S. R. (1999). The 7 habits of highly effective families. Simon and Schuster.

Παραπομπή Chicago Style

Covey, Stephen R. The 7 Habits of Highly Effective Families. UK: Simon and Schuster, 1999.

Παραπομπή MLA

Covey, Stephen R. The 7 Habits of Highly Effective Families. Simon and Schuster, 1999.