1. Aaker, Khmer y Day. Marketing Research, 2001.
2. Alderson, W. Dynamic Marketing Behavior: A Functionalist Theory of Marketing. Richard D. Irwin, 1995.
3. American Marketing Association, AMA. Marketing Definitions: A Glosssary of Marketing Terms, 1960.
4. American Marketing Association. Report of Definición Comitee of the American Marketing Asociatin. Chicago, 1987.
5. Barak, A. Perceptions of Age-Identity. Psychology & Marketing, 2001:1003-29.