References
- Sheldon A. Evolution of environment: Uncertainty and the need for competitive strategy. Strategic Action. 1983
- Patz A. L. Strategic decision analysis. Little, Brown., Boston 1981
- Hofer. Straregic management. West., New York 1980
- Lovelock C. H. Concepts and strategies for health marketers. Health care marketing: Issues and trends, P. D. Cooper. Aspen Systems Corp, New York 1981, Sheldon, A. (1984). Marketing mix (class notes). Harvard School of Public Health, Boston, MA
- Porter M. E. Competitive strategy. Free Press., New York 1980