Cita APA (7th ed.)

YUKL, G. A. (1989). Leadership in organizations.-- ed.2. Prentice Hall.

Cita Chicago (17th ed.)

YUKL, Gary A. Leadership in Organizations.-- Ed.2. New Jersey: Prentice Hall, 1989.

Cita MLA (9th ed.)

YUKL, Gary A. Leadership in Organizations.-- Ed.2. Prentice Hall, 1989.