Manning, G. L. (1998). Selling today: Building quality partnerships (7th edition.). Upper Saddle River, N.J.: Prentice Hall.
Παραπομπή Chicago StyleManning, Gerald L. Selling Today: Building Quality Partnerships. 7th edition. Upper Saddle River, N.J.: Prentice Hall, 1998.
Παραπομπή MLAManning, Gerald L. Selling Today: Building Quality Partnerships. 7th edition. Upper Saddle River, N.J.: Prentice Hall, 1998.
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