URBAN, G. L. (1993). Design And Marketing Of New Products Glen L. Urban And John R. Hauser. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)URBAN, Glen L. Design And Marketing Of New Products Glen L. Urban And John R. Hauser. Prentice-Hall, 1993.
Lua MLA (8ú heag.)URBAN, Glen L. Design And Marketing Of New Products Glen L. Urban And John R. Hauser. Prentice-Hall, 1993.
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