APA (7. basım) Alıntı

Covey, S. R. (1991). Principle-centered leadership. Summit Books.

Chicago Style (17. basım) Atıf

Covey, Stephen R. Principle-centered Leadership. New York: Summit Books, 1991.

MLA (9th ed.) Atıf

Covey, Stephen R. Principle-centered Leadership. Summit Books, 1991.