Zyman, S. (1999). The end of marketing as we know it. London: Harper Business.
استشهاد بنمط شيكاغوZyman, Sergio. The End of Marketing As We Know It. London: Harper Business, 1999.
MLA استشهادZyman, Sergio. The End of Marketing As We Know It. London: Harper Business, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.