1. Kotler, Philip (1984): Dream Vacations: The Booming Marketing for Designed Experiences, in Futurist, S. 7–13.
2. Maslow, Abraham (1954): Motivation and Personality. New York.
3. McKnight, John (1977): Professional Service Business, in: Social Policy, November–December, S. 110–166.
4. Toffler, Alvin (1980): The Third Wave. New York.