Covey, S. R. (2004). The seven habits of highly effective people ([2nd ed.].). Pocket Books.
Lua i Stíl Chicago (17ú heag.)Covey, Stephen R. The Seven Habits of Highly Effective People. [2nd ed.]. London: Pocket Books, 2004.
Lua MLA (9ú heag.)Covey, Stephen R. The Seven Habits of Highly Effective People. [2nd ed.]. Pocket Books, 2004.
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