Covey Stephen R. (2004). 7 Habits of highly effective people. Pocket Books.
Chicago-viite (17. p.)Covey Stephen R. 7 Habits of Highly Effective People. London: Pocket Books, 2004.
MLA-viite (9. p.)Covey Stephen R. 7 Habits of Highly Effective People. Pocket Books, 2004.
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