Covey, S. R. 7 Habits of Highly effective People (7 kebiasaan Manusia Yang Sangat efektif). Binarupa Aksara.
Chicago Style (17th ed.) CitationCovey, Stephen R. 7 Habits of Highly Effective People (7 Kebiasaan Manusia Yang Sangat Efektif). Binarupa Aksara.
MLA (8th ed.) CitationCovey, Stephen R. 7 Habits of Highly Effective People (7 Kebiasaan Manusia Yang Sangat Efektif). Binarupa Aksara.
Warning: These citations may not always be 100% accurate.