HARTLEY, R. F. (1983). Marketing Fundamentals Robert F. Hartley. Harper & Row.
Lua i Stíl Chicago (17ú heag.)HARTLEY, Robert F. Marketing Fundamentals Robert F. Hartley. Harper & Row, 1983.
Lua MLA (8ú heag.)HARTLEY, Robert F. Marketing Fundamentals Robert F. Hartley. Harper & Row, 1983.
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