Dillon, W. R., Madden, T. J., & Firtle, N. H. (1993). Essentials of marketing research. Irwin.
Lua i Stíl Chicago (17ú heag.)Dillon, William R., Thomas J. Madden, agus Neil H. Firtle. Essentials of Marketing Research. Homewood, IL ; Boston, MA: Irwin, 1993.
Lua MLA (8ú heag.)Dillon, William R., et al. Essentials of Marketing Research. Irwin, 1993.
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