Cross, W., & Florio, C. (1978). You are never too old to learn. New York: McGraw-Hill.
استشهاد بنمط شيكاغوCross, Wilbur., and Carol Florio. You Are Never Too Old to Learn. New York: McGraw-Hill, 1978.
MLA استشهادCross, Wilbur., and Carol Florio. You Are Never Too Old to Learn. New York: McGraw-Hill, 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.