FENTON JOHN. (1979). A-Z OF SALES MANAGEMENT. HEINEMANN.
Lua i Stíl Chicago (17ú heag.)FENTON JOHN. A-Z OF SALES MANAGEMENT. LONDON: HEINEMANN, 1979.
Lua MLA (9ú heag.)FENTON JOHN. A-Z OF SALES MANAGEMENT. HEINEMANN, 1979.
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