APA Citation

Covey, S. R. (1990). Principle centered leadership. New York: Simon & Schuster.

Trích dẫn kiểu Chicago

Covey, Stephen R. Principle Centered Leadership. New York: Simon & Schuster, 1990.

MLA Citation

Covey, Stephen R. Principle Centered Leadership. New York: Simon & Schuster, 1990.

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