ródło
ródło
ródła: Thomas C. Kinmear i Ann R. Root(red.), 1988 Survey of Marketing Research; Organization Functions, Budget, Compensation (Chicago: American Marketing Association, 1989), str. 43; Joanne Lipman, „Single-Source Ad Research Heralds Detailed Look at Household Habits”, The Wall Street Journal, 16 stycznia, 1988, str. 39; Joe Schwartz, „Back to the Source”, American Demographics, styczeń, 1989, str. 22-26; Magid H. Abraham i Leonard M. Lodish “Getting the Most Out of Advertising and Promotion”, Harvard Business Review, maj-czerwiec, 1990, str. 50-60.