Dyfyniad APA
Covey, S. R. (2004). The 7 Habits of Highly Effective People (25th Anniversary Edition.). Pocket Books.
Dyfyniad Arddull Chicago
Covey, Stephen R. The 7 Habits of Highly Effective People. 25th Anniversary Edition. London: Pocket Books, 2004.
Dyfyniad MLA
Covey, Stephen R. The 7 Habits of Highly Effective People. 25th Anniversary Edition. Pocket Books, 2004.
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