BACON, M. S. (1994). Do-it-yourself Direct Marketing: Secrets For Small Business. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)BACON, Mark S. Do-it-yourself Direct Marketing: Secrets For Small Business. John Wiley and Sons, 1994.
Lua MLA (8ú heag.)BACON, Mark S. Do-it-yourself Direct Marketing: Secrets For Small Business. John Wiley and Sons, 1994.
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