Covey, S. R. (2004). The 7 Habits of Highly Effective People. Pocket Books.
Lua i Stíl Chicago (17ú heag.)Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.
Lua MLA (9ú heag.)Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.
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