Covey, S. R. (1997). The 7 habits of highly effective people. Franklin Covey.
Chicago-viite (17. p.)Covey, Stephen R. The 7 Habits of Highly Effective People. North Provo, Utah: Franklin Covey, 1997.
MLA-viite (9. p.)Covey, Stephen R. The 7 Habits of Highly Effective People. Franklin Covey, 1997.
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