Crimp, M. (1981). The marketing research process. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Crimp, Margaret. The Marketing Research Process. Englewood Cliffs, N. J: Prentice-Hall, 1981.
Lua MLA (9ú heag.)Crimp, Margaret. The Marketing Research Process. Prentice-Hall, 1981.
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