Ichmann, D. R. (1991). Analysis For Marketing Planning Donald R. Ichmann. Irwin.
Lua i Stíl Chicago (17ú heag.)Ichmann, Donald R. Analysis For Marketing Planning Donald R. Ichmann. Irwin, 1991.
Lua MLA (8ú heag.)Ichmann, Donald R. Analysis For Marketing Planning Donald R. Ichmann. Irwin, 1991.
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