Holtje, H. F. (1981). Schaum's outline of theory and problems of marketing. Mc graw hill book company.
استشهاد بنمط شيكاغوHoltje, Herbert F. Schaum's Outline of Theory and Problems of Marketing. New York: Mc graw hill book company, 1981.
MLA استشهادHoltje, Herbert F. Schaum's Outline of Theory and Problems of Marketing. Mc graw hill book company, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.