Covey, S. R. (2004). The 7 habits of highly effective people. Pocket books.
استشهاد بنمط شيكاغوCovey, Stephan R. The 7 Habits of Highly Effective People. London: Pocket books, 2004.
MLA استشهادCovey, Stephan R. The 7 Habits of Highly Effective People. Pocket books, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.