Corey, E. R. (1991). Industrial marketing Cases and Concepts. Prenhallindo.
Lua i Stíl Chicago (17ú heag.)Corey, E. Raymond. Industrial Marketing Cases and Concepts. Prenhallindo, 1991.
Lua MLA (8ú heag.)Corey, E. Raymond. Industrial Marketing Cases and Concepts. Prenhallindo, 1991.
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