Krames, J. A. (2005). Jack Welch and the 4E's of leadership: How to put GE's leadership formula to work in your organization (First edition.). McGraw-Hill.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Krames, Jeffrey A. Jack Welch and the 4E's of Leadership: How to Put GE's Leadership Formula to Work in Your Organization. First edition. New York: McGraw-Hill, 2005.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Krames, Jeffrey A. Jack Welch and the 4E's of Leadership: How to Put GE's Leadership Formula to Work in Your Organization. First edition. McGraw-Hill, 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.