Elling, K. A., & Hirsh, I. R. (1969). Marketing projects and problems: Study guide for an introduction to modern marketing. Macmillan.
استشهاد بنمط شيكاغوElling, Karl A., و Irving R. Hirsh. Marketing Projects and Problems: Study Guide for an Introduction to Modern Marketing. London: Macmillan, 1969.
MLA استشهادElling, Karl A., و Irving R. Hirsh. Marketing Projects and Problems: Study Guide for an Introduction to Modern Marketing. Macmillan, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.