Lua APA (7ú heag.)

KATZENSTEIN, H. (1992). Direct Marketing. Macmillan.

Lua i Stíl Chicago (17ú heag.)

KATZENSTEIN, Herbert. Direct Marketing. Macmillan, 1992.

Lua MLA (8ú heag.)

KATZENSTEIN, Herbert. Direct Marketing. Macmillan, 1992.

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