Dillon, W., Firtle, N. H., & Madden, T. J. (1993). Essentials of marketing research. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Dillon, William, Neil H. Firtle, agus Thomas J. Madden. Essentials of Marketing Research. Boston: McGraw-Hill, 1993.
Lua MLA (9ú heag.)Dillon, William, et al. Essentials of Marketing Research. McGraw-Hill, 1993.
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