Locke, E. A., & Kirkpatrick, S. (1991). The essence of leadership: The four keys to leading successfully. Lexington Books Maxwell Macmillan Canada Maxwell Macmillan International.
Lua i Stíl Chicago (17ú heag.)Locke, Edwin A., agus Shelley Kirkpatrick. The Essence of Leadership: The Four Keys to Leading Successfully. New York, Toronto, New York: Lexington Books Maxwell Macmillan Canada Maxwell Macmillan International, 1991.
Lua MLA (9ú heag.)Locke, Edwin A., agus Shelley Kirkpatrick. The Essence of Leadership: The Four Keys to Leading Successfully. Lexington Books Maxwell Macmillan Canada Maxwell Macmillan International, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.