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APA-viiteCovey, S. R. (2020). The 7 habits of highly effective people: Powerful lessons in personal change (Revised and updated. [30th anniversary edition].). Simon & Schuster UK Ltd.
Chicago-tyylinen lähdeviittausCovey, Stephen R. The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change. Revised and updated. [30th anniversary edition]. London: Simon & Schuster UK Ltd, 2020.
MLA-viiteCovey, Stephen R. The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change. Revised and updated. [30th anniversary edition]. Simon & Schuster UK Ltd, 2020.
Harvard-tyylinen lähdeviittausCovey, S. R. 2020. The 7 habits of highly effective people: Powerful lessons in personal change. Revised and updated. [30th anniversary edition]. London: Simon & Schuster UK Ltd.