APA ציטוט

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

Chicago Style (17th ed.) Citation

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

ציטוט MLA

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