Παραπομπή APA

Holtje, H. F. (1981). Schaum's outline of theory and problems of marketing. Mc graw hill book company.

Παραπομπή Chicago Style

Holtje, Herbert F. Schaum's Outline of Theory and Problems of Marketing. New York: Mc graw hill book company, 1981.

Παραπομπή MLA

Holtje, Herbert F. Schaum's Outline of Theory and Problems of Marketing. Mc graw hill book company, 1981.