Richardson, L. (2006). The Sales Success Handbook. 20 Lessons to Open and Close Sales Now. McGraw Hill Companies Inc.
استشهاد بنمط شيكاغوRichardson, Linda. The Sales Success Handbook. 20 Lessons to Open and Close Sales Now. McGraw Hill Companies Inc, 2006.
MLA استشهادRichardson, Linda. The Sales Success Handbook. 20 Lessons to Open and Close Sales Now. McGraw Hill Companies Inc, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.