Hale, G. A. (1996). The leader's edge: Mastering the five skills of breakthrough thinking. Burr Ridge, Ill: Irwin Professional Pub.
استشهاد بنمط شيكاغوHale, Guy A. The Leader's Edge: Mastering the Five Skills of Breakthrough Thinking. Burr Ridge, Ill: Irwin Professional Pub, 1996.
MLA استشهادHale, Guy A. The Leader's Edge: Mastering the Five Skills of Breakthrough Thinking. Burr Ridge, Ill: Irwin Professional Pub, 1996.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.