APA aipamena

Covey, S. R. (1991). Principle-centered leadership. New York: Simon and Schuster.

Chicago Style aipamena

Covey, Stephen R. Principle-centered Leadership. New York: Simon and Schuster, 1991.

MLA aipamena

Covey, Stephen R. Principle-centered Leadership. New York: Simon and Schuster, 1991.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.