1. The Paradox of American Power;Nye,2002
2. Scanning the Business Environment;Aguilar,1967
3. Managing strategic surprise by response to weak signals;Ansoff;California Management Review,1975
4. Competitive Strategy: Techniques for Analyzing Industries and Competitors;Porter,1980
5. Frühaufklärung für Unternehmen: Identifikation und Handhabung zukünftiger Chancen und Bedrohungen;Krystek,1993