1. Abell, D. F., Strategic Windows, in: Journal of Marketing, 1978, S. 21–26.
2. Abell, D. F., Defining the Business — The Starting Point of Strategic Planning, Englewood Cliffs 1980.
3. Arndt, J., How Broad Should the Marketing Concept Be?, in: Journal of Marketing, 1978, S. 101–103.
4. Bain, J. S., Industrial Organization, 2. Aufl., New York 1968.
5. Bauer, H. H., Marktabgrenzung, Berlin 1989.