Dyfyniad APA

Stephen R Covey. (2004). 7 habits of highly effectie people. Pocket books.

Dyfyniad Arddull Chicago

Stephen R Covey. 7 Habits of Highly Effectie People. London: Pocket books, 2004.

Dyfyniad MLA

Stephen R Covey. 7 Habits of Highly Effectie People. Pocket books, 2004.

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