Dillon, W. R., Firtle, N. H., & Madden, J. T. (1994). Marketing research in a marketing environment (3rd ed.). Irwin.

Dillon, William R., Neil H. Firtle, and J. Thomas Madden. Marketing Research in a Marketing Environment. 3rd ed. London: Irwin, 1994.

Dillon, William R., et al. Marketing Research in a Marketing Environment. 3rd ed. Irwin, 1994.