APA aipamena

Covey, S. R. (1992). Principle-centered leadership. Simon & Schuster.

Chicago Style aipamena

Covey, Stephen R. Principle-centered Leadership. New York, N.Y.: Simon & Schuster, 1992.

MLA aipamena

Covey, Stephen R. Principle-centered Leadership. Simon & Schuster, 1992.