Covey, S. R. (1997). The 7 habits of highly effective people. Franklin Covey.
Chicago Style (17th ed.) CitationCovey, Stephen R. The 7 Habits of Highly Effective People. North Provo, Utah: Franklin Covey, 1997.
ציטוט MLACovey, Stephen R. The 7 Habits of Highly Effective People. Franklin Covey, 1997.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.